Just saw this over at xda and it works perfectly on the froyostone build. Is a live wallpaper that is a 3D tunnel with blocks that fall down the tunnel. You can customize the colors and motion of everything.
http://forum.xda-developers.com/show...=746565&page=1
video of background in action
http://www.youtube.com/watch?v=Q9xJPowscNE