Wordle lets you take any document and create a word picture based on the word counts. It's quite asthetic to look at, and sometimes seeing the most common words does give a new insight into the key concepts within. Other times, it's just a jumble of words!
Here's one I did based on the book History of the Warfare of Science with Theology in Christendom by Andrew Dickson White in 1895.
Here's another of the Book of Judges in the Old Testament.
