I have a pack of 129 of Cowboy Bebop wallpapers pulled from an AnimePaper siterip. None have been removed since the rip, so some are 4:3, and some are crappy in the way that old wallpapers are. You know what I mean- big text pointing out the obvious "COWBOY BEBOP", poor flow, a bunch of images 'shooped together, etc
I'll dump a few of the good ones
Anyway
http://www.mediafire.com/download/obuvsqxo3jzc0am/Bebop%20wallpapers%20(AnimePaper).zip