Color Mixing Chart: use these variations when mixing colors.
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*While it lasts,,,here is a link to more information: http://www.twopeasinabucket.com/feature_article_20010514.asp


Decorator's Color Wheel

In the center are the primary colors - Red, Yellow, and Blue. From these, all others are made.

In the inner ring are secondary colors - orange, green, violet, made by mixing equal amounts of primary colors. Mix red and yellow for orange, mix red and blue for violet, and mix blue and yellow for green.

In the outer ring are the tertiary colors - achieved by mixing varying amounts of one primary color with the adjacent primary. Mix a large amount of red with a small
amount of blue and you will get a red-violet color. Do the opposite for blue-violet. Increase or decrease amounts form many hues in between.


Color Mixing Chart: use these variations when mixing colors.
TIPS:
1. To lighten any color, add small amounts of white icing
2. To darken any color, add small amounts of specified darker color of icing
3. For pastels, add 2 parts of white icing to 1 part of any colored icing
4. For purple icing using buttercream, the icing may have blue casts if you don't use milk to make your buttercream.
TIPS:
From CHEFMASTER® PRODUCTS Food Coloring Manufacture...
Apricot - 2 parts Orange & 1 part Egg Yellow Maroon - 4 parts Red Red & 2 parts Burgundy Raspberry - 3 parts Bakers Rose & 1 part Christmas Red
Aqua - 5 parts Sky Blue & 1 part Leaf Green Ivory - 1 Liquid Whitener & a touch of Brown and Egg Yellow Ruby Red - 1 part Holiday Red and a touch of Black
Avocado - 4 parts Lemon Yellow & 1 part Leaf Green and a touch of Black Jade - 1 Leaf Green & 1 Royal Blue & a touch of Black Rust - 8 parts orange & 2 parts Red Red & 1 part brown
Burgundy - 5 parts Bakers Rose & 1 part Violet Lavender - 5 parts pink & 1 part Violet Sea Gold- 2 parts Sky Blue & 1 part Leaf Green
Chartreuse - 2 parts Lemon Yellow & 1 Leaf Green Marigold - 3 parts Lemon Yellow & 1 part orange Silver - 1 part Black and 1 part Blue
Copper - 1 part Egg Yellow & 1 part Brown & 1 Christmas Red Melon - 1 part Orange & 3 parts Bakers Rose Skin tone - 12 parts orange & 4 parts Bakers Rose & 1 part Royal Blue
Coral - 3 parts Rose Pink & 2 parts Lemon Yellow Moss Green - 2 parts Violet & 3 parts Lemon Yellow Teal - 9 parts Sky Blue & 1/2 part Lemon Yellow
Dusty Rose - 2 parts Christmas Red & 1 part Malt Brown Navy Blue - 1 part Sky Blue & 1 part Violet Turquoise - 6 parts Sky Blue & 1 part Lemon Yellow
Gold - 10 parts Lemon Yellow & 3 parts Orange & 1 part Christmas Red Persimmon - 1 part Orange & 1 part Bakers Rose Wine - 3 parts Holiday Red & 2 parts Rose Pink
Plum - 1 part Violet & a touch of Christmas Red Grape - 1 part Sky Blue & 6 parts Bakers Rose Misty Green - 2parts Leaf Green & 1 part of Royal Blue & a touch of Black
 Note: Blend the colors before adding them to the icing. Add the blended color to the icing to get the shade desired.
Frosting Color Chart
I found this one on the web somewhare, sorry, don't remember where. Hope it helps.
Apricot 2  Orange + 1 Golden Yellow
Aqua 5 Sky Blue + 1 Leaf Green
Avocado 4 Lemon Yellow + 1 Leaf Green + touch of black
Burgundy 5 Rose Pink + 1 Violet
Chartreuse 5 Lemon Yellow + 1 Leaf Green
Rust 8 Orange + 2 Red + 1 Brown
Copper 1 Golden Yellow + 1 Brown + 1 Xmas-Red
Hunter Green Kelly Green + small amount of black
Coral 3 Rose Pink + 2 Lemon Yellow
Lavender 5 Pink + 1 Violet
Black Mix left over color icing together, then add black skin tone - Use a small amount of copper
Silver (Gray) 1 Black + 1 Blue
Turquoise 6 Sky Blue + 1 Lemon Yellow
Teal 9 Sky Blue + small amount of Lemon Yellow
Dusty Rose 5 Rose Pink + 1 Violet
Mauve 5 Rose Pink + 2 Orange + 2 Red + 2 Black
Plum 1 Violet + a touch of Christmas Red
Gold 10 Lemon Yellow + 3 Orange + 1 Red
Maroon 4 Red Red + 2 Burgundy
Ivory Use ivory paste
Moss Green 2 Violet + 3 Lemon Yellow
Navy Blue 1 Sky Blue + 1 Violet
Grape 1 Sky Blue + 6 Rose Pink
Raspberry 3 Rose Pink + 1 Christmas Red
Ruby Red 1 Red Red + 1 touch black

More - this from WILTON:

Color Tips
 

                    Wilton paste food color is concentrated, giving vivid or deep colors
                    without changing consistency. Add paste color to icing, in small amounts
                    with a clean toothpick or spatula.

                    When making deep colors, such as black, brown, or red use Wilton
                    paste food colors in larger amounts than normal. It can take as much as
                    1 oz. paste food color per one cup to obtain deep colors. Deep colors
                    are recommended for accent colors only.

                    When icing is colored deep red, a bitter aftertaste may be detected.
                    Red No-Taste should be used when a large portion of red coloring is
                    used on the cake. Red No-Taste does not contain red 3 which causes
                    the bitter taste.

                    When white buttercream is tinted dark black, it also can have a bitter
                    taste. Use dark chocolate icing with a small amount of black color
                    added.

                    Colors deepen in buttercream icings upon setting; color icing 1-2 hours
                    before decorating. Colors fade slightly in royal, boiled or Color Flow
                    icing as they set.

                    Brown color occasionally has a green overtone to it. This usually occurs
                    with the presence of acid in the icing; lemon juice or cream of tartar.
                    Omit the acid if tinting icing brown. Also dissolving brown color in 1/4
                    teaspoon water before adding to icing will eliminate the green tone.

                    White-white is used for lightening icing that has been colored too dark.
                    Also use it for making white buttercream made with butter or margarine.

                    All deep colors in nature stain, like blueberries, but none of them are
                    harmful. Paste colors can stain teeth and skin; however, simply washing
                    skin area with soap and warm water will remove color. Bleach can be
                    used on counter tops.

                    Lukewarm water should be used first to spot stained color. Rinse
                    thoroughly, allow to dry. If color is still visible use a commercial cleaner
                    on garment, carpet, upholstery, etc. In the case of a color that has Red 3
                    as an ingredient use an acid such as vinegar or lemon juice to soak stain
                    first. Proceed with lukewarm water and then allow to dry before using a
                    commercial cleaner.

                    Sometimes lemon juice or cream of tartar will cause colors to change, i.
                    e. violet will become blue. If the recipe has one of these ingredients in it,
                    omit it. In addition, some water (from various geographical areas) tends
                    to cause color changes. If buttercream icing is made with water, use milk
                    instead.

                    Usually, "bleeding" colors on a decorated cake is a result of improper
                    storage. It is not recommended to ice cakes while they are still frozen, as
                    the cake needs to "breathe" while it thaws. Allow the cake to defrost
                    before icing to help prevent the colors from bleeding.

                    An air tight cover on cake stored at room temperature may encourage
                    condensation to form which can cause colors to bleed.

                    Sunlight or fluorescent light will cause some colors to fade. After the
                    cake is decorated, it is best to keep in a cool room and out of direct
                    light.

Wilton Icing Color Chart

                    When mixing color always mix a small amount of color to experiment.
                    Start with base color and then add very small amounts of secondary
                    color. Be sure to mix enough color for the cakes to be decorated as it is
                    difficult to match an exact color.
 

                         ANTIQUE GOLD Add just an extremely small touch of
                         Leaf Green to golden yellow

                         AQUA Sky Blue and Leaf Green

                         AVOCADO Use Moss Green color

                         BLACK Our paste color or Royal Blue, Christmas Red,
                         Orange and Lemon

                         CHARTREUSE 9 parts Lemon Yellow, 1 part Leaf Green

                         CORAL Watermelon makes a very attractive coral color.
                         Or bright Creamy Peach

                         FLESH Add just an extremely small touch of Copper to
                         white icing. Ivory can also be used. Light pink with a small
                         amount of brown.

                         GRAY Add just a touch of Black to white icing.

                         HUNTER GREEN Kelly Green and a touch of black

                         JADE Leaf green, Royal Blue and a touch of black

                         LAVENDER Pink and violet

                         MARIGOLD Lemon Yellow and orange

                         MAROON Burgundy and Red Red

                         MAUVE Touch of Burgundy with very little black.

                         MISTY GREEN Leaf Green, Royal Blue and a touch of
                         black

                         MOSS GREEN Our paste color or violet and lemon
                         yellow

                         MULBERRY Mix Rose with a touch of Royal Blue.

                         NAVY BLUE Royal blue and black

                         RASPBERRY Pink and Red Red

                         RUST Orange, Red Red and Brown

                         SILVER We do not advise attempting to simulate silver
                         color in icing. Instead, add silver leaves or other silver
                         accessories to the cake.

                         TEAL Use teal paste color or lemon yellow and sky blue

                         TURQUOISE Sky Blue and Lemon Yellow

                         WARM GOLD Use Golden Yellow with just a touch of
                         brown.

Notes About Wilton Paste
                    Colors

                         RED

                         There are three different reds - Christmas Red, a
                         blue-toned red; Red-Red, an orange toned red; and
                         Red-No Taste, a blue toned red.

                         Note: It can take as much as 1 oz. of red paste color to
                         one cup of icing to get a deep red.

                         GREEN

                         Leaf Green is a brighter green with more yellow than Kelly
                         Green. Both of these greens require very little color, how
                         much color added depends on the tone of the green you
                         want.

                         HOT PINK

                         Rose paste color will obtain hot pink with good results.
                         Rose Petal is a soft, muted rose color. Pink is a traditional
                         pastel with a slight yellow tone.

                         BLUE

                         Royal Blue has a red tone. Sky Blue has a yellow tone.

                         DAFFODIL YELLOW

                         Daffodil Yellow is an all natural food coloring and does not
                         contain yellow #5. (Many people are allergic to this).
                         Daffodil Yellow currently contains alcohol which all other
                         colors do not have present.

Icing Color Uses

   Cookie Dough
                         A fun way to add color to cookies is to bake it right in! It's
                         easy--Knead small amounts of Icing Color into prepared
                         Roll-Out Cookie Dough until desired shade is reached. Roll out,
                         cut into shapes and bake! Take it one step further by piping
                         decorations on unbaked cookies using thinned tinted cookie
                         dough.
                         Here's how--Thin a small amount of tinted dough with 1 tsp.
                         Water at a time until it will pass through a small round decorating
                         tip. Add outlines, details, and even flowers. Bake following recipe
                         instructions.

                         Easter Eggs
                         Create a rainbow of colored eggs for Easter matched to your
                         basket, outfit, or bonnet! It's easy, fast and convenient, using
                         Wilton Icing Colors. Put 1 tsp. Vinegar in 3/4 cup very hot water.
                         Mix in icing color until the water is a very deep hue. Let water set
                         a few minutes, stir until completely dissolved, then begin to
                         brighten and color dozens of eggs! Experiment with different
                         colors, using a test egg to try out different combinations! Your
                         Easter egg-coloring possibilities are endless--even the Easter
                         bunny couldn't do better!

                         Bread Dough -- Just add icing color to the dough while
                         kneading! For an extra special touch, bake bread in one of
                         Witon's shaped pans.

                         Punch -- You may choose to color your punch or you can use
                         Wilton's Singles!™ Molds to make ice cubes. It is best to make
                         the molds with lemon-lime soda to avoid watered down punch.



WILTON Icing Color Mixing Suggestions
When mixing color always mix a small amount of color to experiment. Start with base color and then add very small amounts of secondary color. Be sure to mix enough color for the cakes to be decorated as it is difficult to match an exact color.

ANTIQUE GOLD Add just an extremely small touch of Leaf Green to Golden Yellow

AQUA Sky Blue and Leaf Green

AVOCADO Use Moss Green color

BLACK Our paste color or Royal Blue, Christmas Red, Orange and Lemon

CHARTREUSE 9 parts Lemon Yellow, 1 part Leaf Green

CORAL Creamy peach and a touch of pink or orange and a touch of pink.

FLESH Add just an extremely small touch of Copper to white icing. Ivory can also be used. Light pink with a small amount of brown.

GRAY Add just a touch of Black to white icing.

HUNTER GREEN Kelly Green and a touch of Black

JADE Leaf green, Royal Blue and a touch of Black

LAVENDER Pink and Violet

MARIGOLD Lemon Yellow and Orange

MAROON Burgundy and Red Red

MAUVE Touch of Burgundy with very little Black.

MISTY GREEN Leaf Green, Royal Blue and a touch of Black

MOSS GREEN Our paste color or Violet and Lemon Yellow

MULBERRY Mix Rose with a touch of Royal Blue.

NAVY BLUE Royal Blue and Black

PERIWINKLE Royal Blue and Violet

PLUM Use violet with a touch of Christmas red.

RASPBERRY Pink and Red Red

RUST Orange, Red Red and Brown

SILVER We do not advise attempting to simulate silver color in icing. Instead, add silver leaves or other silver accessories to the cake.

TEAL Use teal paste color or Lemon Yellow and Sky Blue

TURQUOISE Sky Blue and Lemon Yellow

WARM GOLD Use Golden Yellow with just a touch of brown.