I hadn't baked anything since moving to Honesdale, so I made my first baking venture exciting:
Basically you just take white cake batter, separate it into different bowls, and dye the batter (gel dye works best for brighter colors).
Then dump a spoonful of each color into the cupcake liner.
And, voila! A super simple (albeit time-consuming) way to make a groovy cupcake!