Here are the ones I had on my computer already. I'm pretty sure none of these are in use. ^^
http://smg.photobucket.com/user/arycollection/library/Unused%20avatars?sort=3&page=1
I am also willing to make sigs if you'd like. ;) I am working right now on cropping a few and uploading them so I can post a link for you to some possible avatars that I'm pretty sure aren't taken.
I would also be more than happy to help you find a face. I have a bunch of possible avatars on my computer that I could easily upload and post a link for you if you would like.