I haven't had much time to make some good signatures because of some animations (anime!) and games I'm working on, but here's something I quickly put together.
#2 This one's from last year's christmas
#3 This one's very old. Was like a 3 minute work.
#4 3d render test
Well, for avatars I haven't really done much lately.
#1 This is a snapshot from my anime Zombie Hunter which I use as my avatar:
#2 And this here's an animated one for Merodi: