In a mixing bowl, combine all the ingredients for the cake, and blend on high until smooth and creamy.
Place cupcake liners in the sections of a muffin tin, and fill each one almost to the top.
Bake for 20-25 minutes until browned and cooked through completely.
Let the cupcakes cool to room temperature.
Icing
Add all the ingredients for the icing to a mixing bowl, and blend until smooth and fluffy.
Separate the icing into 3 separate bowls, and place a few drops of different food coloring into each bowl. Stir to combine.
Add spoonfuls of each of the colored icings to a piping bag or decorator tool, and pipe the icing onto the top of the cupcakes. The colors will meld as you pipe the icing.