I saw this post on Boing Boing the other day, thought 'I can do that' and bought some toy knights at our corner shop on the way home from work. I was going to get Arthur to help but apparently he doesn't believe in melting army men.
The instructions were clear and worked. The only thing I'd add is that you get some pretty noxious fumes off it. They're probably not that healthy. I'd make sure you do it with some windows open.
The only problem is that I don't think anyone really wants it in the house. It's more than slightly disturbing, especially if you've seen the Chapman's Hell.
Still, perhaps, a nice gift for the festive goth in your life.