It's customizing time again! Aves Studios has come out with something really spectacular, it's called Fixit-Sculpt and I've just received some. Let me tell you I am VERY pleased with the results and will be using it from now on. Head to Aves Studios to read about their new product and order it by phone.
You'll probably want some sculpting tools to work with as well right? Head to this link [Sculpting Tools] and pick out a set you'd like to use. I have a set of the 6" long double-sided kind. There's some neat carving ones with the hollow section in the middle for carving, and your basic dental picks that are very useful. They're fairly cheap, $6 to $12 usually and will last a very long time.