How to set up a rotating wallpaper in both Windows and Linux?

This is pretty much self-explanatory. I want a setup where every, say, fifth time I boot into my Windows install or my Linux install (same computer), my wallpaper changes to the next image in a particular folder on my hard disk. I want it to fill the screen in stretch mode. I run Windows XP Pro and Debian etch with Enlightenment and 7.1.0-19. Just a single monitor this time.


Google “Wallpaper switcher”

There are millions of them with a variety of features.

I guess there are a lot, although the one I found and use is Microsoft’s “Wallpaper Changer” (free) but that’s Windows only, not Linux.