This awesome project was sent in by Max. Thanks max!
Here’s what they had to say:
In this blog post Max Lupo goes through his process for lightly modding the classic NES Super Mario Bros.,in order to insert himself as a character. While note quite a “how-to”, the post rounds up all the links and resources you would need to mod your own game, and flash it onto a blank game cartridge to play in a real NES.
In the gif above, the left side shows the first four tiles which compose Mario’s upper torso, and the right side shows a sample of the subsequent tiles used in the game. Note that the whole graphic is made from screengrabs of Nixel, a browser based sprite editor. Luckily, in the Super Mario Bros. rom, the data for the sprites is in a pretty logical order: just about all the tiles for the Mario sprites are aligned left to right, head to toe.