Changer XP is an integrated tool to personalize the IE Skin, the desktop wallpaper, the Screen Saver as well as the boot screen of Windows 9x/Me/2000/XP all in one.
You can program desktop wallpaper, IE skin, screen saver and boot screen to change automatically after a specified time period (e.g. every 30 minutes). You can even change them in seconds, minutes, hours, and days!
More info:
hxxp://www.nihuo.com/changerxp/index.htm