This is for my own reference. I will comment with the books I read and the number they correspond to. I'm actually really excited about this challenge!
1) A book with more than 500 pages
2) A classic romance
3) A book that became a movie
4) A book published this year
5) A book with a number in the title
6) A book written by someone under 30
7) A book with non human characters
8) A funny book
9) A book by a female author
10) A mystery or thriller
11) A book with a one word title
12) A book of short stories
13) A book set in a different country
14) A nonfiction book
15) A popular author's first book
16) A book from an author you love that you haven't read yet
17) A book a friend recommended
18) A Pulitzer Prize winning book
19) A book based on a true story
20) A book at the bottom of your to-read list
21) A book your mom (or dad) loves
22) A book that scares you
23) A book more than 100 years old
24) A book chosen based entirely on it's cover
25) A book you were supposed to read in school but didn't
26) A memoir
27) A book you can finish in a day
28) A book with antonyms in the title
29) A book set somewhere you've always wanted to visit
30) A book that came out the year you were born
31) A book with bad reviews
32) A trilogy
33) A book from your childhood
34) A book with a love triangle
35) A book set in the future
36) A book set in high school
37) A book with a color in the title
38) A book that made you cry
39) A book with magic
40) A graphic novel
41) A book by an author you've never read before
42) A book you own but haven't read yet
43) A book that takes place in your hometown (or surrounding area)
44) A book that was originally written in a different language
45) A book set during Christmas
46) A book by an author with your same initials
47) A play
48) A banned book
49) A book based on or turned into a TV show
50) A book you started but never finished