One powerful feature of Android is the "LIVE Wallpaper". The above shows one example of my windmill farm wallpaper from my Samsung Galaxy S2 screenshot. From 6am to 6pm, the wallpaper will show the day with white clouds moving and from 6pm to 6am, it will show the night with stars and every shooting stars. It the location service is turned on and the local weather is rainy, snowing, it will change accordingly.
Googled "Android Live wallpaper and you will find many other interesting Android LIVE wallpapers.