"Rainbow Cupcake Frosting" Could be done on rainbow cupcakes. This looks yummy as well as pretty. I'm not a big fan of sweets, and I have little to no fondness for chocolate cupcakes, but I totally want to eat that.
Disney Princess Cupcakes by rozthurman.sallee for a princess party. Paper cut outs with color printed princess's placed on top of cupcake that's iced and rippled as skirt and in appropriate color for individual princess.