How to Quilt a Fondant Cake.although I don't use fondant, I would bet you could freehand a butter crème frosting using this idea. (how to make frosting for cakes)
Easy unicorn party recipes: Enchanting Unicorn Birthday Cake -- that's at least easy for more advanced bakers.
Spring cake idea--Quilling with Fondant & Gum Paste (a tutorial)
Hamburger Cake Tutorial by Evelindecora