(not a typical) Science Fair Idea?

Hello, I was wondering if you guys have any Science fair suggestions? I don't want to do a typical run of the mill fair. As a matter of fact I am looking for ideas to make it into ISEF (Intel international fair) or ones that MIT would be interested in. For example, last year, as a Freshman I did a project on making an alternative to infared motion detectors and created an Electro-Magnetic based motion detector and ran tests with statistical ysis. That project won me second at the Kentucky State Science fair. I have the option of continuing that project or starting over with a completely new idea and project . I am looking for something on par with that or higher. Can anyone help?