Wow, you are very observant!
I was at a Von's chain grocery store in my neighborhood in California last week and parked next to an old, kind of dirty and dinged up little car. The car and windows where all decorated with white painted words, "Led Zeppelin," along with the group's symbols and other Zep stuff hanging from the rear view mirrow and on the dash. After coming out of the store, the car was still there, so I wrote a little note: "Led Zeppelin Rules!" and tucked it under their windshield wiper blade. I was just at the same grocery store tonight and saw the car again. Must belong to an employee.