don't bother. studying pictures is unnecessary for path. they show pics of basic stuff that you come across in general studying or in question banks (hypersegmented neutrophils, target cell, spherocytes, polyp, kid with blue eyes, etc). i used goljan so his book had a lot of good pics. however, most of the pic questions can be answered by the question. just run through the FA pics in the back of the book the day before your test.
the only pics where it requires you to know anything specific are the anatomy questions. so know your xrays, MRIs, CTs, etc.