I mentioned yesterday that I made three birthday cakes for Pipsqueak. You've already seen the first one... the rainbow cake. I did the colors with Wilton Color Spray which I loved using. I was afraid it would run since I was putting it on a vertical surface, but as long as I held the can back six inches as instructed, it held beautifully.
I loved using the color spray so much that I used it on the next project... cupcakes for her class on her birthday. I made them bakery-fancy with piped on frosting and used two colors of spray in sort of a yin and yang pattern. Then I topped them with coordinating sprinkles. I was really happy with the way they turned out, and plan to make color spray and regular part of my kid cake repertoire (as if I had a repertoire). I recommend Wilton Color Spray, and no one paid me to say that.
If you grew up in the 70s or 80s, you probably remember Gunne Sax well. Here's a little blurb about the company that I found interesting.