Koi Free Live Wallpaper - Android Apps on Google Play. One of the best things about Android is the ability to install live wallpapers. You can have moving leaves, stars, or whatever. One of the best of these is the Koi Live Wallpaper that was seen in the demo I posted in which the presenter was using the Note II as a PC replacement. You can get it here for free, or, for 99 cents, you can customize the fish and tank. Very cool. Looking at a Koi tank in your phone, and watching the water ripple when you touch the surface. Very Zen. Peace and contentment to you, brother human.