projectM Music Visualizer (Android) app for $0.75
projectM is a Milkdrop-compatible music visualizer. It can be used as a live wallpaper or standalone app. projectM will visualize any sound playing on your Android device. If there is none, projectM will visualize your microphone input. You can browse through the extensive preset library and rate your favorite presets.
On first start, projectM will download 150 presets into /sdcard/projectM. This is just to get you started. There are thousands of presets available online to try out. Make sure you start projectM standalone once before starting the live wallpaper or you will only have one preset!++