Raphael built a custom adapter — same ones used to connect SNES gamepads — for an old SNES Mario Paint mouse. It’s compatible with all Linux systems. One more pic after the jump.
From the article: “Why do that? Here are a few good reasons: (at least, those are good reasons for me!) The ability to play Mario-Paint with the real original mouse. (Authenticity). The possibility of using your good old mouse which reminds you a lot of good childhood memoires to do real work. (Nostalgia). Because you can, and it’s cool. (Cool factor)”