John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
PingPoint - Never miss a Mark Zuckerberg signup to your app ever again
DesktopSlides - DesktopSlides is a light and user friendly desktop wallpaper changer for windows.
ReIcon - ReIcon is portable freeware that enables you to save and restore your desktop layout.
FCorp My Desktop - "ALL-IN-ONE" Desktop Related Tools.
AeroWallpaperChanger - AeroWallpaperChanger is another "wallpaper changer" software for Windows 7.