An interesting experiment in Sweden shows that behavior can be modified by nothing more than the introduction of “fun.”
Adding the piano-key musical steps dramatically increased use of the stairs. This experiment is part of a Volkswagen-sponsored effort called The Fun Theory which encourages behavior modification using fun. Other concepts (not all implemented yet) include a speed trap camera that fines speeders and pays out money to compliant drivers, a traffic light that shows trivia to stopped motorists to encourage waiting for the green light, and a trash bin/juke box that plays music when people recycle bottles and cups.
Do you want your customers to behave differently? Can you think of a way to accomplish that using fun?