• A book with more than 500 pages
• A classical romance
• A book that became a movie
• A book published this year (2015)
• A book with a number in the title
• A book written by someone under 30
• A book with nonhuman characters
• A funny book
• A book by a female author
• A mystery or thriller
• A book with a one-word title
• A book of short stories
• A book set in a different country
• A nonfiction book
• A popular author's first book
• A book from an author you love that you haven't read yet
• A book a friend recommended
• A Pulitzer Price-winning book
• A book based on a true story
• A book at the bottom of your to-read list
• A book your mom loves
• A book that scares you
• A book more than a 100 years old
• A book based entirely on its cover
• A book you were supposed to read in school but didn't
• A Memoir
• A book you can finish in a day
• A book with antonyms in the title
• A book set somewhere you've always wanted to visit
• A book that came out the year you were born
• A book with bad reviews
• A trilogy
• A book from your childhood
• A book with a love triangle
• A book set in the future
• A book set in high school
• A book with a color in the title
• A book that made you cry
• A book with magic
• A graphic novel
• A book by an author you've never read before
• A book you own but have never read
• A book set in your hometown
• A book that was originally written in a different language
• A book set during Christmas
• A book written by an author with your same initials
• A play
• A banned book
• A book based on or turned into a TV show
• A book you started but never finished

From here.