My sister just pointed me to
Wordle. Paste in the text of your book and it'll make a word cloud from most frequently-used words. You can pick the font, the colors, and tweak the layout. Addictive--and actually could be a good writing tool, if you want to see what words you tend to use most frequently.
I pasted the first three chapters of CANDOR into Wordle, and here's what I got (click on the image to see the full version):