A toy forum I frequent mentioned these (created by someone from the forum).
I make pick one up and make my avatar.
http://www.thinkgeek.com/product/19c6/?srp=13
While I don't really care for the sculpt on the Female, the concept is really cool. If you end up making your Avatar out of this, you definitely have to post pics.
Those are actually kinda nifty. I kinda wish he had a variant for bald heads (which would work for full masks and you can sculpt your own hair) but there's a lot that can be done with stuff like this.
They are pretty cool, but i would like if they had a bulky make for Hulk-type heroes.
These are awesome and would be great for testing paints for customs. I think I'm going to pick up one or two.