http:/ / www.nuonsoft.com/ wallpapercycler/
Wallpaper Cycler is an easy to use program to get rid of that boring static wallpaper on your desktop. Use this program to rotate or change the wallpaper with a specified delay or at a specific time. Supports over 20 different image formats. Wallpaper Cycler includes an advanced random choice algorithm. This algorithm makes sure that if certain wallpapers get picked one time, they will not be picked again until ALL other wallpapers have been picked.
