"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.
colorful swirled cupcakes - Chica applies paste food coloring to the sides of the pastry bag with a brush and then fills it with the frosting mix. Multicolor rainbow swirls adorning your favorite cupcakes.