If you don't find something that excites you that way, you should also go to a school's website and read about the research there, and email the principal investigator directly. That is how I got a terrific project at UCSF between year 1 & 2. Send an impressive email, tell them why you want to be there, and you might find an outstanding opportunity just waiting for an enthusiastic medical student such as yourself! If you don't find something right away, just keep trying.
GOOD LUCK!!