LOVE this! Hide Common Core questions under their seat and announce 'hot seat' sometime during the day. Whoever has a question under their seat has to answer it :) Perfect way to review/have fun!
Bookface Photo Contest--this would be nice to have everyone submit, then post a slideshow on the TV in the library!
Exploring the mystery genre in the library is a great way to expose students to new types of literature and who doesn't love solving a real crime?
How to make Laurel Crowns - I think this is a great craft idea for younger kids when studying Roman history.