I should have been more specific. I meant Wheater's review book, which is about 200 pages and is somewhat like a histology/pathology image-based question bank in print. I think it would suit the OP's needs well.
As far as sites, here are a few good ones:
Blue Histology
WebPath, which you probably already know about, and
VisualHistology, which is good for EM images, as infrequent as they are.