We have seen quite a few fun accessories for the Nintendo Wii, but I think this one might just be slightly over the top, the Wii Bowling Ball.
It is shaped like a normal bowling ball, and you can put your Wiimote inside it, it even has controls on top of the bowling ball.
I can see this thing doing more damage to LCD and Plasma TVs than the Wiimote, there is no word on pricing or availability.
Product Page via Oh Gizmo