Rainbow cake , AWESOME! description from baker: I just used box white cake mixes - 10 of them that I bought on sale. I had 6 6x6 cake pans and I mixed and baked 2 cake mixes at a time, divided them into 6 bowls and mixed in Wilton gel food coloring bought at JoAnns. It's not that hard to do. The hardest part was actually mixing all the icing up (it was a cream cheese frosting) - I had to do it in 4 batches because it just wouldn't all fit in my KitchenAid (powdered sugar everywhere).
Make a boxed cake mix taste like a bakery cake! 1: Look at the directions on the cake mix. 2: Add one more egg (or 2 if you want it very rich). 3: Use melted butter vs. oil & double the amount. 4: Use milk vs. water. 5: Mix well & bake for the time recommended on the box. You can also add Vanilla Extract