I oohed and aahed over the Mac Classic keycap, but this one did it for me. Based on the NES, but actually the Japanese version (the Famicom) it's nicely detailed and comes complete with interchangeable light-up cartridges. Goodness me, that's nice. There's even a small slab of plastic wood to store the bits on. The whole thing comes in a nice plastic box for storage.
It's nicely detailed. It fits on keyswitch stems just fine. You'll need a north-facing LED to get the cartridge to glow, but the paper isn't really translucent so you either need the brightest LED ever or you'll have to replaced the paper label (or take it off). I don't like lights on a keyboard, so it didn't matter to me.