Wordle at www.wordle.net is a Java Applet that makes a cool image from any copied text. for example, the following was created when I pasted in the Gettysburg Address (by Abraham Lincoln).
It goes through and removes any common words from the language of choice, and then makes the image where each word is sized based on its frequency in the copied text.
Even cooler is that after creating the image you can go in and play with the font, color scheme and the layout. I have a preference for words at horizontal and vertical angles but you can mix it up more than that with words going every which way.
I think that this would be cool to be able to put on a t-shirt or as a poster. It does let you print it out but I have not done so.