Start with a packaged white cake mix, cream cheese icing and food coloring. FYI - You will also need any additional ingredients that are on the back of the cake mix box. Mix the cake batter according to the instructions. Then divide into separate bowls depending on how many colors you want.
My color choices: red, blue, purple, yellow and green
Drop the colors on top of each other into cupcake liners. Bake according to instructions.
Let the cupcake cool before frosting.