I stumbled across this image today by Gui Borchet and was inspired to try something similar.
I adapted my space-finding/word-filling code that I have used for Word Hearts, Clustered Word Clouds, and a few other projects and produced this image of Barack Obama. The image is built out of many repetitions of the text fragments 'HOPE', 'CHANGE', and 'YES WE CAN' in various shades and sizes.
Click image to see a larger version