A few nice photo to poster images I found:
fairey poster photo source?
Image by stevesimula
After seeing an article about someone purportedly discovering the original photo source for Shepard Fairey's now-famous poster, I did a little digging myself and think they're wrong. The image I found on this site, seems to me to be a much better match.
intrepidliberaljournal.blogspot.com/2006/10/reminiscing-a...
Particularly note the eyes.
Purl Harder Poster
Image by Mr. T in DC
Wartime poster exhorting knitters to remember Pearl Harbor and "purl harder." Photo of a reproduction; the original is in the collection of the Library of Congress, and was originally created under the WPA, so I think it's OK to post it here as it should be in the public domain.
Interactive Poster Construction
Image by kmakice
To make my interactive poster for CHI, I needed to cut some ducting sheet metal to allow my magnetic photos to stick. I prototyped the engineering with my test poster, which was a slightly thinner material.