[Osiris]

Source Computer Desktop Wallpaper Changer WallPapa

A wallpaper change will change the wallpaper of the computer desktop periodically. They usually allow the user to add wallpapers to the interface which will then be picked randomly according to the user’s preferences. WallPaPa is no difference from the rule as it allows Windows users to set some preference to change wallpapers on their computer desktop periodically. All aspects of the computer program can be configured in the main interface.
Here it is that the user adds folders or single wallpapers to the list that are rotated by the program. It is possible to add multiple folders and subfolders to the program in case there are several directories containing wallpapers on the computer system.

[Trotter]

Would this work for Win7? Oh, wait... it has it built in.