The very crafty folks over at I Am 8bit have modified some roombas with classic video game icons, including Mario Goombas and Koopa shells along with a Zelda Octorock (or Mr. Parodius if you squint a little.)
I don't know, they may not be able to beat DJ Roomba.
Game enthusiast and modder RetroBrad developed a re-make of Super Mario Brothers using an eight-by-eight pixel screen. The game is kept largely in-tact by condensing characters and environments into simple single-pixel creations. Way rad!