3D Terrain + Gyroscope/rotation sensors = The most awesome free live wallpaper.
It's a pretty advanced wallpaper, and it's 100% free. the most recent update stripped all in app purchases, notification, etc. It is now 100% free to use with all content in the future.
Update was done for stability on newer devices, and to strip payments from the application.
If you enjoy, feel free to send your appreciation, no money necessary.