Do you have SystemUI memory leak?
Do you want a completely black wallpaper to save power on your AMOLED screen?
Do you want to save memory by bypassing the wallpaper engine?
Black Live Wallpaper is for your.
It did completely nothing but a black screen. It bypass all the system wallpaper engine. So it consumes almost no system resource at all.
To enable it, select BlackLiveWallpaper in the live wallpaper selection dialog. This app contains no launcher icons.