Here's a good idea that came to mind from my old hometown:
In the early 1970's, Gas City was one of the first independent petroleum marketers to sell dairy products. To promote this new product, Mr. McEnery purchased a fiberglass cow and placed it on the roof of his first location at 55th and Pulaski in Chicago. The cow stayed there until the roof gave way to the cow's weight in 1976. This fiberglass cow now has a permanent home at the Gas City corporate headquarters, which was relocated from Chicago to Frankfort, Illinois in 1972.