The real thunderstorm (or Beautiful thunderstorm) is an amazing free live wallpaper for Android. It has a spectacular storm with clouds, rain and very realistic thunderbolts. You can change the sky and select the moon or the sun in a wonderful sun rise.
Also, It has cool graphs and It has a very low battery consumption.
Try it and you will not regret it!
first you have to download it, then: home -> menu -> wallpapers -> live wallpapers.