Illustration | Shepard Fairey
These two posters are from Shepard Fairey. Beautiful and interesting - I love both their boldness and their subtlety (with their collage effect). Shepard also produced the poster, Make Art Not War, that I have sitting in the sidebar on the left (thanks for that info Jan). There's a great interview with Shepard here if you would like to know more about him and his beautiful illustrations.