Have any fantasy downloads? Because I just found one for you: Play classic Nintendo games on your computer — with a mere Firefox extension! That's right, just download the FireNES add-on, click Tools, FireNES, and a giant list of NES games pops up.
The best is when you actually go to play them, and they look exactly as you remember! I geeked out over Paper Mario World last year, but this is the closest thing I've seen to the real thing while also being the easiest to get. Pick from several versions of Donkey Kong, Jeopardy, Bubble Bobble, and minimize when the boss comes by!