These are a collection of the various desktops that I have used in the past. They are the size that I used them in, which changed from time to time. Most of the recent ones are 1600x1200 so you should be able to resize them to your screen resolution.

These screens are taken from various places. Some I created myself from other, smaller images. Others I simply copied.

1280x1024	1280x960	1280x960	1280x960
1600x1200	1024x768	1600x1200	1600x1200
1600x1200	1599x956

I also have a compressed file with desktops from Digital Blasphemy. This collection has some pretty awesome stuff in it.

Digital Blasphemy desktop collection (22.5MB)