"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.
Bee, Look at this: Baby Cupcakes: Each adorable baby is tucked into a bed of frosting. User baked chocolate and vanilla cupcakes, frosted them with buttercream, and decorated each with a fondant baby and blanket. So cute!