Animal Index Cards by Hiroshi Sasagawa. Not yet available in the U.S., but Japanese residents can buy them here. First seen at lost.net.au/vic.
I remember being fascinated by a book where literary creatures poured out of books into a library. A cross-hatched giraffe sauntered between bookshelves, doves flew out from a wedding scene, and Ariel flopped down from The Little Mermaid. I've probably blended different pop culture sources* into one non-existent book, but if anyone else remembers reading this, please tell me the title! It's driving me nuts.
These two products, both by Japanese designers, give the same goosebumps-inducing sense of text transformed into flesh. Both have been featured on countless blogs, too, although the index cards aren't available stateside (some have suggested DIYing it).
*I wonder if I've reimagined a chapter of Urusei Yatsura (click through for a scan)? There's a deranged kangaroo, but no giraffe.

The Story Behind the Bookmark, by Yuko Tokuda & Yumiko Komiya, $16.00 each at Greener Grass Design. First seen at PingMag.
Scan from Urusei Yatsura by Rumiko Takahashi. From "Feudal Furor," translated by Viz.