Those standard white Xbox 360 controllers just not doing it for ya? Check out what one forum member by the alias of MueMue on R&G Online did:
MueMue used the shell of an extra controller to create the mold. Not too shabby of a job! I can’t read German, so if there are any more details, feel free to read the forum and post them in the comments here. Just thought it would be something cool I’d share with you guys.