Have you seen the Lawrence Public Library's "If you liked the Hunger Games..." readalike flowchart?
Ms. Peso, the librarian at Glenbrook North High School has created her own for John Green's The Fault In Our Stars and Paper Towns!
Want to take a look? You can find her charts are on the Spartan Library Blog.
And, if you're interested in making your own book flowchart, Ms. Peso used the browser add-on LucidChart. It's free and, according to Ms. Peso, very easy and fun to use.