John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
NeoDownloader - As you know, there is a lot of websites with a lot of pictures, music and movies.
FCorp My Desktop - "ALL-IN-ONE" Desktop Related Tools.
WFDownloader App - A free bulk image downloader application that also serves as a multi-purpose bulk downloader for your PC.
WallpapersEveryday - Gorgeous wallpapers on your desktop in just one click or auto-delivered at chosen time intervals.
Transloader - Start downloads on your Macs, remotely from other devices