Vintage Bookplates.

Neatorama reader Lewis Jaffe has a quirky blog about collecting bookplates or ex libris [wiki] (a printed piece of paper pasted on the inside front cover to show the ownership).

Lewis' collection is fantastic: he has images of ex libris from Walt Disney, Samuel Colt, and even one for Rockefeller as drawn by Pablo Picasso!

Check it out: Link - Thanks Lewis!