Have your background change based on date, time, zodiac sign or moonphase with wallpaper clocks.
Live wallpaper made to use wallpaper clock backgrounds found on Vlad Studio site (http://www.vladstudio.com).
This is a Lite version with limited functionality in the download section.

You can use and select any wallpaper clock if you manually download it and put it in "wallpaperclock" folder on your SD card. If this procedure too annoying for you please buy full version of app.
The application is primarily designed for the tablets and landscape usage.
NOTE: this program is not affiliated with Vlad Studio, it just implements it's file format standard.