Egg Yolk Paint

Here's a fun recipe I got off a bag of flour years ago. It was originally meant for sugar cookies, but also works great for gingerbread cookies.

Roll out cookies and cut into shapes as desired. Place on a cookie sheet.
After cookies are painted, bake as usual.

Cookie Paint - Egg Yolk Paint -
Mix 1 egg yolk and 1/4 teaspoon water. Divide mixture among several small custard cups. Tint each with different food color to make bright colors. If paint thickens wile standing, stir in a few drops water.