Make 2 boxes of your favorite white cake mix. I use gel food coloring because the color is deep and true. You can get it at craft supply store or order it online. Get your batters to your desired colors. Remember though that it will bake a touch darker.

I start with blue on the bottom.

Add the white layer, then cover the top with red. I spread the red all over the top because I want people to be surprised when they bite into these.

I made a batch of cream cheese frosting. (I used 1 stick of butter, 1 brick of cream cheese, 2-3 cups powdered sugar, a teaspoon or so of vanilla. Beat until light and fluffy.) You could always use a canned frosting too.

Take the sparkly decorating gel and draw two blue lines and two red lines on the inside of the piping bag. Fill the bag with the white frosting. When you pipe it, it gives a cool tie-dye, effect.

Customize the cupcakes with your favorite sprinkles and non-pareils.