Each teacher picks their favorite book from the book fair and then students try to guess which teacher chose that particular book. Could also say "Come take a look at our favorite books!" if you have ordered bulletin board books.
This is a fun idea. "It's a new year. so put on a new (book) face for our latest and greatest library contest! Here's what you do:Find a book with a face or part of a face on the cover.Put your face in the book.