All buttercream. I'm not very good at piping yet, and I'm afraid to decorate directly onto the cake for fear of messing it up, so my method is to trace a cookie cutter on wax paper, then fill in w/different colors, etc., and pop into the freezer. After it's frozen, I run a thin spatula between the design and the wax paper to release it, then pop it onto the cake. Where there's a will, there's a way. Cakes used to intimidate me, but the more I do them, the more comfortable I feel.