John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Christmas HQ - Totally free holiday icons, images, borders and fonts
Wallcat - Enjoy a new, beautiful wallpaper, every day.
IconStore - Free icon packs by first-class designers
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Merry Christmas Design Assets - Over 40,000 high-quality Christmas assets from Iconscout to bring the spirit of Christmas to your designs.