This postcard from ripple(s), made for William Corbett’s poem “Remembering Michael Gizzi,” which is about the Woodberry Poetry Room at the library of Harvard University, seems to me to count as a library shenanigan.

Addendum, April 2014: The Dayton Metro Library in Dayton, Ohio encouraged its patrons to make poems out of spine titles. Thanks, Dina Wood, for letting me know!