Why isn't Ballpaper still available in Play Store?
There is no application listed on the Play Store listed as Ballpaper. I've searched on Play Store, Android Informer and other market websites, but it doesn't appear which could also mean that the app is either discontinued or no released at all. The only thing close to Ballpaper is Bouncing BallPaper Free.
You can get more information here: http://bouncing-ballpaper-free.android.informer.com/