Nowadays, a lot of popular consoles have USB adaptors for their gamepads, but if you really want that nostalgic feel, here's how to convert your old gamepad into a USB controller for your PC.
Whether playing video games with the keyboard just doesn't do it for you, or you're really trying to recreate that old game console feel, this is a mod sure to bring back memories from simpler times. You don't need any super deep knowledge of electronics to pull this off, although be forewarned that there is a bit of soldering involved. Other than that, though, the project isn't too difficult — it's just a matter of connecting ribbon cable to each individual button. The instructions use an old SNES controller, though you could likely recreate it with any old school gamepad. There's even an optional mod for a built-in accelerometer to control the mouse. Hit the link for the full instructions, and let us know if you've ever pulled anything like this off in the comments!
USB Game Pad With Tilt-Accelerometer Mouse [Instructables]