This is a Christmas ornament I've designed for the DIFFA charity, which helps sponsor AIDS treatment.
Stage one: Find sculpting materials and a base to build upon.
I used a six-inch plastic ornament as a base. I put a sandwich bag of small gravel inside to give it some weight. The white sculpting medium is Crayola Model Magic, which has the weight and consistency of marshmallow fluff. It's *terrific* stuff. This part of the project took three or four hours.