I saw a special on TV that sounds like what you are referring to DrT, regarding savants. I remember to induce more creativity they placed magnets on, I believe, the right side of the brain...but I'm not certain about that. I believe a magnetic pulse (?) was administered for a period of 15 minutes, which caused one side of the brain to become more active than the other (obviously the right side to induce savant-like effects). I really think you should do more research (or at least some, considering this is something which has been experimented with many times) before just sticking magnets onto your head and seeing what happens?
edit: this was a special on National Geographic or Discovery Channel or something like that, I highly recommend you trying to find and watching it, I'm sure it's available online and will probably be very helpful