Rainbow Petals Birthday Cake

Petal cakes are so fun and so impressive, but easy enough to do. The hardest part was the prep and mixing all the colors so I could just petal it on. Also I had made a double batch of the American buttercream from my previous post and it didn't hold it's shape well enough to make the petals, so I had to re-make a batch of buttercream the traditional way and prep it - what a headache! Now I have a huge bowl of buttercream I don't know what to do with... I guess I'll have to do some more baking!

Music Credit: Sia - Rainbow (From The 'My Little Pony: The Movie' Official Soundtrack)