I'm honestly not sure what was there, but I have a few that I haven't seen mentioned by others that I assume may have come from that site. When I said all, too, it might've been a slight exaggeration. Here's my list if you want to PM me for one:
Asakusa 1600x1200
*Cowboy Bebop 1600x1200
Chiyoda 1600x1200
The Dawn is Your Enemy 1600x1200
*Eureka Seven 1600x1200
*Eureka Seven 2 1600x1200
*FLCL 1600x1200
Fujiyama 1600x1200
Fun4Adults 1600x1200
*Ghost in the Shell 1600x1200
*Ghost in the Shell 2 1280x1024
Ginza 1600x1200
*Paranoia Agent 1600x1200
Shinjuku 1600x1200
Shinjuku 2 1600x1200
You Can Be Happy 3072x2048
*These have the [adult swim] label in the image, but they're not bump images. Perhaps those were from that page?
On a related note, I'd like to see some widescreen images released. If anyone sees any, it'd be good to know.