Here's a tip for those constantly on the lookout for new wallpaper for their computer desktops:
If you have a digital camera, turn the flash off and run around the streets at night, snapping random things. Aim the camera at the pavement, into the sky or into the oncoming traffic. The quicker you run, the more abstract and strangely beautiful the results. If you like, you can then adjust the hue and saturation in Photosop and voila! groovy wallpapers. You could even print them out and frame them as abstract art.
I made these last night, and have saved them in a folder on my Mac desktop. When my machine starts up, it chooses one of these at random as the background pic. Click on the thumbnails to see the full 1024x768 pictures. And feel free to download them and save them as your own wallpaper if you like them.