BingWallpaper is a simple app that will set Bing Image of the day as your Desktop Wallpaper. This app will check for a new wallpaper every time you login, if available it will set it as your Desktop Wallpaper. Just add the app in Login Items in Users & Groups preferences or run it manually. Note: Might not work well on Retina Displays since max resolution of bing wallpapers is 1920×1200.