Nintendo Age forum user bunnyboy is responsible for the Frankensteinian concoction of cool you see above: the NES RetroVision. It follows the same principles of the Super Game Boy, except in that it functions with the NES. By cramming the guts of a Game Boy into an NES cart, bunnyboy uses a custom board to translate the Game Boy graphics into a format understood by the NES. Utilizing a second controller, you can then change the border and colors displayed on-screen.
There isn't a page or any way to order one of these kits just yet, though bunnyboy promises that he'll eventually have some for sale. If you want one, you're going to have to fork over $130 plus shipping.
[Via never know tech]
Nintendo Entertainment System 1st-gen
Nintendo Super Game Boy 1st-gen
Nintendo DS Lite
Nintendo Wii console