Nope, you're gonna need to be a mod for that, for future reference to any who don't know;
Regular User: 160 x 64
Mods: 160 x 100
Super Mods and Admins: Fuck if I know, but they HUUUUUUGE... should they so wish....
Regarding the avatar itself, well not my thread, so I'll let Digs attend to that =w=
But because I can, I'mma say the real reason why you can't have 100x100 is because you said female CT would be raped and left to die in a gutter :<