Chameleon Wallpaper Changer is a basic wallpaper changing utility for Windows. It changes your wallpaper on a schedule you set, that's all.
I did not want to give a thumbs down, but this does not work on my Nvidia GeForce 8200 w/xp svc pak 3, dual screens. It flickers but does not change screens. If I do a screen refresh, it changes. I have occasionally seen this behavior before on other computers.