Here we go! Took long. However, this is far from done! It's up to YOU to give me suggestions! Hope you like what I've added.
Many of these are of course copied from actual official drawings... but some are hand-drawn. The ones I can remember I drew myself are the Last Airbender troupe, and Invader Zim.
So, go forth and tell me!
Update Sept 22 2012: yeah I'm really slow.