Just stumbled on the following site and thought this is a great idea for WWII scenarios. Inflatable fake tanks on the battlefield. The enemy could be a deadly force of tanks or just an ingenious piece of art.
http://www.ghostarmy.org/index.php?page=homepageIn June of 1944, an exceptional U.S. Army unit went into action in Normandy. Its weapons included hundreds of inflatable tanks and a one-of-a-kind collection of sound effects records, and it carried out its battlefield mission without firing a shot. The unit was officially called the 23rd Headquarters Special Troops, but it was known to its men as The Ghost Army.