I made a couple of wallpapers recently... rather simple-looking, but good nonetheless
[ Looking Down ] - Took this picture a long time ago (I found this caterpillar at the engineering counselling centre). Just adjusted the contrast and saturation levels to give a 'professional' touch to an otherwise crappy photo. If for some reason you like the caterpillar a lot, you can see more pictures of it in my photo gallery.
[ Molten ] - This was made from another of my very early photos. It's actually a picture of the bottom of a door, but it doesn't look quite like it, does it?
[ The Roof ] - Two overexposed photos superimposed seamlessly. I was getting bored sitting in my hotel room in Manipal last week, so I took out my camera and started taking some pictures. I looked out the window and saw the stained roof and thought it had potential for a wallpaper. This is the result.
Note that these wallpapers are high contrast images, so they'll probably look better on new monitors (which are brighter).