I used Duff's tie-dye cake mix. It is a white cake mix that comes with red, yellow and blue food color. My only complaint is that the box tells you how many drops of food color to put in each bowl of white cake mix, but the food color came out in globs, not drops, so I had to guess. The color turns vibrant a minute or so after mixing it into the cake mix.
I used about 1/2 tablespoon of each color of batter for each cupcake -- in order to get a full layer of each color. One box made 12 cupcakes, and they were a bit full. I baked them for 18 minutes (there are no baking times for cupcakes on the box). I was very happy with the result!
I used blue frosting (from a tub), AirHeads candy, and mini marshmallows to decorate the cupcakes (thank you to my friend Amy at sometimes creative for the inspiration!). We bought Rainbow Dash at Target -- she came in a "blind bag" but there is a little window on the back if you want to know which pony you are buying.
Happy Birthday to my little Brony!
