Pieter Levels Inspiration - Quotes on a new tab from @levelsio
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.
Get After It - Free wallpapers to keep you moving 🖼️
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.