The Kraft recipe site uses lemon, lime and strawberry, but I can’t see why it matters which kind, just pick the colors you like. I used raspberry, orange and lime
1container of frostingKraft says vanilla, but after using that, I think I would prefer a “fruity” flavor to go along with the fruity flavor of the jello
Instructions
Make up the cake mix according to the regular directions, and divide the batter into three bowls equally.
Add 1/4 cup of a different color to each bowl and mix with a spoon.
Then spoon 2 Tablespoons full of each color into each cupcake liner. 1 cake mix makes 24 cupcakes.
I even used a book under the pan so it would tilt a bit and keep the colors from running together so much, while I was filling the pan.