This app allows you to set your phone to display a procedurally generated digital rain (Matrix effect) while charging or docking. No two times will be the same! It uses the "Daydream" feature introduced in Android 4.2.
It is highly customizable, including:
Completely custom colours
Colour using the battery charge
To use simply go to your settings, select Display, then select Daydream/Screensaver and select the app! You can also change the screensaver settings there.
There is also a shortcut that takes you straight there!
Please note: This is a screen saver, NOT a wallpaper. You will not be able to apply this on your home screen!