I found this idea through a party website and can't remember the name (since this was month's ago). Tonight I made my first rainbow cake and it was very easy, might I add delicious!
I used food coloring to color the cake. I wanted to do a ricotta cream cheese frosting, however I didn't have enough cream cheese and just decided to use regular frosting.
I'm going to attempt to make my son's 1st birthday basketball cake. Wish me luck!