Wordle is a toy for generating “word clouds” from text that you provide. The clouds give greater prominence to words that appear more frequently in the source text. You can tweak your clouds with different fonts, layouts, and color schemes.
The images you create with Wordle are yours to use however you like. You can print them or save them to the Wordle gallery to share with your friends.
Copied from the site, these were created for The Odyssey and The Picture of Dorian Gray.
You may want to create one for your book!