You've seen "word clouds," which represent visually the importance or weight given to different words or terms in a text, so that more frequently used words appear larger in the cloud.
Here's a website that creates word clouds out of text you provide.
Write your sweetie a love letter and then attach a word cloud, proving
that it's not a myth that you use the word "earlobe" altogether too
often.
Write George Bush a letter and then attach a word cloud of the letter's text, showing him how big the word "asshole" is in the word cloud.
(Let's distort the outcome here: Bush asshole Bush asshole Bush asshole Bush asshole.)
Here's what the text above looks like as a word cloud: