John’s Background Switcher (or JBS for short) periodically changes the wallpaper on your computer (like every hour or every day) to something interesting. JBS sits in your system tray (down by the clock) and changes your background at the time interval of your choosing.
DesktopSlides is a light and user friendly desktop wallpaper changer for windows. You can set DesktopSlides to change your desktop wallpaper at a predetermined time interval (e.g. every 10 minutes) and customize the wallpaper position (tile, center, fit to screen) easily.