FYI that someone has written a plugin for Muzei (a popular minimalist
background switching app on Android) that switches your background among
random recent Commons Picture of the Days every few hours.
I've really enjoyed seeing a variety of beautiful Commons-y things on my
phone since I've started using it; so I thought I might share here.
Code:
https://github.com/ebraminio/WikimediaCommonsForMuzei
You can get it through F-Droid:
https://f-droid.org/repository/browse/?fdid=org.wikimedia.commons.muzei
Muzei, the parent app, which is really quite simple and beautiful itself- a
nice model in what a pleasant-to-use Android app can be:
https://play.google.com/store/apps/details?id=net.nurik.roman.muzei
FYI-
Luis