I love decorating cakes but I don't love making many different colors of frosting because one it is a pain, and two, it's hard to get the colors correct and dark enough without using the expensive dyes made specifically for frosting. I also do not like fondant. So I invented my own cake paint and it's super easy and costs almost nothing. You only need three ingredients - powdered sugar, food coloring, and water.
I just put about 1-3 teaspoons of powdered sugar in a little glass cup, added a few drops of food coloring and stirred with a paint brush. Then I added a drop or two of water to thin it out. You want it thin enough to paint but not too thin or it will run, basically about the consistency of acrylic paint, but maybe just a touch thinner. If it is too thin just add a pinch or two of powdered sugar. Then just paint it onto your frosting with paintbrushes.
