DailyPic - You like the Bing Picture of the Day?
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
PhotoMapper - Photomapper is a cross-platform application for Android and iOS devices designed from the ground up to provide you with informational guides and tips on the best photo spots in the world.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Really Good Photo Spots - Really Good Photo Spots is a user-friendly iPhone app that assists photographers in locating the ideal photography spots in different corners of the world.
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android