Becrux Wally - Wally is a Qt4 wallpaper changer, using multiple sources like files, folders, FTP remote folders, Flickr, Panoramio, Ipernity, Photobucket, Buzznet, Picasa, Smugmug, Google, Vladstudio and deviantART images. Now it's available in many languages!!
Pixiv for Muzei 3 - Best Pixiv plugin for Muzei 3
DesktopSlides - DesktopSlides is a light and user friendly desktop wallpaper changer for windows.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Random BackGround - Random BackGround desktop wallpaper slideshow with advanced features for Windows
Wallpaper Cycler - NuonSoft WallpaperCycler is a powerfull utility to manage all your wallpapers and to automatically cycle between your wallpapers.