Wordle 

Wordle is a toy for generating “word clouds” from text that you provide. The clouds give greater prominence to words that appear more frequently in the source text. You can tweak your clouds with different fonts, layouts, and color schemes. The images you create with Wordle are yours to use however you like. You can print them out, or save them to the Wordle gallery to share with your friends.

Example: This wordle was made from the words in the description above. The more times a word appears in the text, the bigger they appear in the Wordle image. You have font and color options so you can personalize your Wordle.