I would make different flavors using cake mixes and canned frostings that match each flavor. The directions will give you baking time for cupcakes.
Chocolate cake mix with Chocolate frosting
White cake mix with Vanilla frosting
Red Velvet cake mix with Cream Cheese frosting
Strawberry cake mix with Strawberry frosting
German Chocolate cake mix with Coconut Pecan frosting
Good Luck!