I doubt this would work in any more structured interview process for a regular job at a larger company (with the likely expection of VP+ level jobs), but it could be very effective for interviewing at startups, especially when they're small enough for you to be interviewed by one of their founders.

A good way to do this is probably not to take charge immediately upon concluding the small talk, but to simply ask whether the interviewer would be interested to set aside some time to see some ideas you had prepared for their business (shows binder)