This one is for making book portraits. Allows to picture out a color chart of a book
by counting number of color name references in a text.
Native working js version (less than 100 lines of code, lol) available at http://a.teall.info/bookportrait/.
Some more examples.
The Hobbit by J.R.R. Tolkien:
Much more life-asserting.
And The Lord of the Rings, three books one by one. Last book is really grim one.