Make Chocolate Butterflies Using Wax Paper and Books! The Books give it a realistic pose. The Template/Pattern is included in the Tutorial! I could see white chocolate ones on a white cake. : ) Also other ideas on cupcakes.
Intricate Cake Design (no details given, but I imagine this is just white chocolate piped onto a hand drawn or printed design on wax paper, put into the freezer and then adhered to cake with dots of melted choc) Cute for cupcakes too!