Muzei

With the help of the Muzei app, users will get their home and locks screen on a daily basis with backgrounds from various selections. To make things even more interesting, the developers from Muzei have implemented a mode that keeps the background blurry so that the icons seem more evident.
 
There are quite a few available sources already, so it’s unlikely that you will go through the entire collection in a hurry.
 
Of course, users can choose to display the backgrounds of their choosing, which can be rotated through every few hours. The code for the Muzei app is available online, and other developers can build a wallpaper source with the API that is graciously provided by the official devs.