( Google Play link )
This feels like it needs a cleverer name, but I've been at a loss so am going with the simple one for now. :)
Lines is an abstract live wallpaper with a collection of lines streaking across your screen. They move in/out of the scene as you slide the camera, and respond to touch with via vibration and color changes. The nice thing about this one it it's graphically simple enough to be extremely performant, even on fill-rate starved devices like a Galaxy Nexus.
If you're in the mood for something abstract, give it a shot!