WeaponsMan has an excellent post up on the cartoonists of the Great War, and the topic called to mind something I'd seen during my recent travels.
There is a restaurant in Española, New Mexico by the name of El Paragua. If you look near the restrooms, by the stairs to the second-floor dining area, you'll see an empty picture frame on the wall. Step closer and you'll see why it's there:
famous cartoon World War II dogface, put there by New Mexico native Bill Mauldin himself.