I have been meaning to ask, what sort of hair do you use for the ponies and where do you get it from?
As for Sculpey (yes I read the comments, I'm lame xD), my local craft shop has just started stocking the one that you bake in the oven, which I hadn't been able to find anywhere in my town before. It's much better quality than the air dry stuff and unlike Fimo clay doesn't warp when it's baked. It is very heavy though although I'm not sure if that's my crummy sculpting skills or the fact that G3 ponies are ridiculously light... heh.
I look forward to seeing more pony customs from you, I love them!