Quote Originally Posted by bmac
hehe. When I first started working at Yahoo! I answered the main phone # at headquarters. You would be surprized how many people would call each day and ask random questions like that. Our answer was basically the same as Starbucks'. The person you spoke to probably didn't have a clue about how or who did it, and if you got to the proper department, the probably didn't want to tell you for fear that you were a copeting business, or a photographer looking for work.

If you are really interested, call and ask for their public relations department. They might have an answer for you.
If they are the same as the pictures around here, they look like lithos of some gum print originals. The pictures sure are not real gum, but they sure look like it from 7 feet away.