John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads

Wallpaper background - Wallpaper background is another free to use mobile personalization application that lets you enjoy more than 10 million high-quality wallpapers, consists of multiple categories such as Nature, Movies, Places, Flavors, and Games etc.

Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.

Audiko - Audiko Ringtones is a free to use mobile application that can help you customize your mobile phone by setting the most beautiful images your background and the most popular ringtones as your notification signals.

Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.

Pitch Black Wallpaper - Pitch Black Wallpaper is an application, allowing you to set the pitch-black wallpaper to your smartphone or tablet.