For all of you out there that still have an original Xbox controller, and have an Android device running Jelly Bean, this article on XDA might interest you. Apparently there is a simple mod that you can do to the controller and all that you need to buy is a USB OTG (on the go) cable. With a little bit of stripping (wink, wink) and matching up colored wires, you too can have your very own modded controller!
The full thread with details on how to to mod the Xbox controller can be found here.
The full thread with details on how to to mod the Xbox controller can be found here.