Book Jar: "Write down the titles of books you want to read on little slips of paper and then put them in a jar (or whichever container you deem suitable! Then randomly pick one out of the jar to decide what to read next." What a fun idea!
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.