At the FoL sale today, I got a copy of a well-illustrated biography of Darwin that had a ticket to the Velasquez exhibit at the National Gallery (2007) in London used as a bookmark.

Also bought a copy of a Lonely Planet book, Tales from Nowhere, with a $1 banknote from the Central Bank of Belize for a bookmark - very colorful, with Queen Elizabeth on the front and a coral reef plus a strip of jungle with tapir and toucan on the back.