WallpapersEveryday - Gorgeous wallpapers on your desktop in just one click or auto-delivered at chosen time intervals.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
BioniX Desktop Wallpaper Changer - Free desktop wallpaper picture changer/desktop wallpaper manager software.
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Bing Wallpapers - The Bing Wallpaper app delivers the Bing image of the day—arguably the single best feature of Microsoft’s web search engine—to your desktop.
Wallpaper Cycler - NuonSoft WallpaperCycler is a powerfull utility to manage all your wallpapers and to automatically cycle between your wallpapers.