Have some time on your hands and don’t want to remain idle and be associated with the devil’s workshop? This DIY capacitive sensitive floor tiles project ought to suit you then, as it allows you to construct a USB-connected DDR controller from scratch. You will use an Atmel ATmega8 microcontroller inside to run the V-USB firmware, while analog to digital converts to read in data from the capacitive sensors. Not too sure on whether this system is durable in the long run or not though, as hardcore DDR players can attest to.