When you say crazy, I think of work that doesn't take training and you wonder how they ever became famous, but because of some promoter they were made famous.
Some of those in my opinion would be,Mairovich, kandinsky, Kokoschka, Pollack, Miro, Kline, Rothko, just to name a few.
Crazy but talented, I would have to say Bosch, Dali.
