Star Tip Rainbow Cake

So here's my first Wilton class cake. Don't look too closely, or you will see how horrible the blue frosting job is. Also, when my cakes were cooling on the rack, my little daughter helped herself to a big chunk of one of them. I caught her before she had taken too many bites out of it, so the piece just got toothpicked back in, but I wasn't paying attention, and that section ended up right in front, instead of in the back where it should have been.