2 egg yolks
Colorings

Beat 2 egg yolks in small dish. Divide among 4 custard cups (1 1/4 teaspoon each).

For blue and green, stir 1/4 teaspoon coloring into each cup. For all other colors, stir 1/2 teaspoon coloring into each cup. (BLACK - combine 1 whole egg yolk, 1 1/2 teaspoon green, 1 1/2 teaspoon red, and 5 drops blue.)

Use small, clean paint brush to paint designs on cookies before baking. Bake as directed.