Make a game controller with modular parts based on arduino or as a mod of an existing controller like ps3,xbox 360,wii classic or Wii U. For example you can have the buttons of xbox360 and joystiq of ps3 or somthing like that.Also controller could be split in half and connect the 2 parts in a tablet and have it work as wii u controller. Lets say you have a samsung galaxy tab 2 7.00'' (otherwise it would be too big ) ,the right part connects to the power-data port and the left part with connects to the audio jack, then you can hook it up to your video game console or pc with usb and/or bluetooth .Anyone could modify it to match his/her taste.
ps. it would be awesome to make it as thin as possible.
