If it helps any, here's a moderator asking everyone to please turn away from future discussion of tubgirl or goatse.cx; because eventually someone's going to try and post it for real, and I'll have to ban them, and all that unpleasantness.
I just had to GIS "tubgirl" to figure out what you guys were talking about.
Big mistake.
I guess I'm lame, my home wallpaper is just one of the Windows XP images. It's the blue "hyperdrive" looking thingy. I need to update it to something better.
At work, there is nothing, but I'm only using a temporary computer until I get my own assigned to me.
At home I go with a picture of my dog. At work I go with a picture of an H-Bomb blast. I see that as a proper means of giving the correct impression as to my disposition.
I do MMORPG digital art, so my desktops (2 at home, 1 at work) all contain the picture I did the most recently that I liked the most. It's not always perfect since I'm still learning the genre but it helps boost my artistic self-esteem to put up a piece I did and say "See? I really like this one!"