recently completed this PlayStation 3 boomerang controller. The boomerang was originally shown with the PlayStation 3 prototype, and was severely panned by the press... but now it's a reality as a result of some custom modification work.
He started with a cheap 3rd-party controller that was approximately boomerang shaped. He enlarged the controller body ~20% using bondo. The internals were replaced with gear from an official Sony controller. It was finished with a coat of black paint.
It's definitely a nice build and the new internals mean it probably feels as good as any factory controller.
To quote: What I basically did was take a cheap PS2 boomerang-ish shaped controller, and take its guts out and modify a REAL official Six Axis Controller and put it inside the shell. I also expanded the shell 15%.
I got the controller painted black, so it would be a batman inspired "Batarang Controller".
Please excuse my picture quality. My 5mp camera thinks brand new batteries, are dead. Also, excuse my bondo job. It was my first time.
You can see the white PS button. I didnt put any image there due to copyright reasons.