microbes ;-)
I just love it its dark but has vibrant colours. It come on the device not seen a port on market yet and it's very addictive feeding the digital organisms just to see how infested you can get your screen.
Sorry but if your using a black wallpaper to save battery then for God sake go buy a spare battery I got a 1900mhz battery from Ebay with nfc and anti over charge for ?3 with free postage & packaging and it's not let me down yet got my original as a swap out and dont even notice I'm carrying it.