An XXL game pad with in inside the ION based PC.
Change the PS logo in the PS button into a nVidia logo lighted by a green LED or more.
At the backside where Sixaxis is written, you can write Blu-Ray and put a blu-ray player that 'sucks' the discs like in the PS3 in place of the USB port.
Can use the 'Start' and 'Select' button for boot and reboot button (or other?)
An other funny idea is to make the same as above, but make the buttons on the pad usable in windows or in 'basic' games.
I haven't any creative ideo for the joysticks, can be arrive later