Anyone else like retro gaming? You cant beat a bit of bomberman, an epic FFVII battle or a classic amiga top down shooter like Chaos engine.
Heres the stuff you need for all that for free! (oh you might need a cheap joypad also)

Emulators...
SuperNintendo EMU (this one works out of the box, good for beginers to emulators.
Playstation1 EMU(A bit more fiddling about with this but its quite simple to play PS1 games on your PC!)
Classic Amiga EMU( Now this takes a little more tweaking but once you get going its worth it)

If you need help finding the games then ask me, Have some fun FFS!