Have a look at this site. It has uniquely designed wallpapers and skins for programs.

http://www.deviantart.com/

Ah , my sister in law has an account there as well. Its a nice site with many talented amateurs posting their stuff..

Which reminds me another perfect site but for photography enthusiast..
http://www.photosig.com/

and here are the pictures that i have in photosig, taken in the past .Its been a long time since i last uploaded but i still often surf the site for seeing some amazing photographs....

Nice pictures you have there beleg, I like especially the Frog on the Leaf.

But devianart has great creations, I especially like the minimalistic skins and art, almost like Zen art :lol:

Devianart has all kind of digital-artists.. Its a nice site.