Here are the some of the best wallpapers link collections. They are so beautiful! I just don’t know which one to use.
SmashingMagazine.com: Fantastic Wallpapers That Will Blow Your Desktop Away
sixrevisions.com:50 Stunning and Beautiful Desktop Wallpapers
webdesignerdepot.com:40 Wallpapers Loaded With Color
21 Creative Hi-Res Wallpapers Only for Designers
35+ Colorful And Inspiring Examples Of High Definition Wallpapers
60 Beautiful Ubuntu Desktop Wallpapers
40+ Absolutely Stylish & Creative Hand-picked Wallpapers
25 Creative Typography Wallpapers for your Desktop
26 Gorgeous Aurora and Colour Spectrum Wallpapers
48 Incredible Desktop Wallpaper Inspiration Collection
70 Beautiful Dual-Screen Desktop Wallpapers
Nice list!
Take a look at mine:
http://malevi4.wordpress.com/2009/05/11/creative-desktop-wallpapers/