I would love to see these used as a game object. They are similar to poof balls balls in size and general base geometry, but have a very unique difference.
http://froogle.google.com/froogle_cluster?q=Bumble+ball&pid=4850176807834817 576&oid=17006031747765714766&btnG=Search+Froogle&s coring=mrd&hl=en
Imagine a game object like this which moves either away from you, or towards you constantly.
It would add a whole new element to the game.