Peter the Great's collection of pulled teeth, probably the most influential picture, for me, ever.
Just found this slide show/article, courtesy of Slate, about my absolutely favorite artist of all time, Rosamond Purcell, a few of whose books I mention in the Christmas list, but who is also the extraordinary contributor to Finders, Keepers: Eight Collectors, and the amazing Illuminations: a Bestiary, both incredible books.
Check it out - it's worth reading and looking at! And if you want to put the above two books on your list, well, I won't stop you.
Also, a marvelous review by John Crowley of Purcell's work.