A mural on the side of the barber shop in Jensen Beach, Florida. It was painted about 7 years ago by students at a local Martin County High School. Reportedly took about three days but I am not sure how much of that time was spent painting and how much was spent being teenagers. :-)
Note it is a 1 cent stamp.
The shop is only one building away from the FEC crossing on Jensen Beach Blvd.
H/T Chickenmom for the stamp image