In my twenties I researched my interest in clowns and discovered there is a register for all clown make up in the world. This practice began in 1946 at the home of a British Clown, and the images were painted on chicken egg shells. Now the eggs are ceramic. They are held at the office of Clown International in England. There is also now a registry in the U.S. The faces on eggs are arranged in a drawer with the name of the clown to make the actual design of each clown's makeup unique and copyrighted to the clown concerned.
Here's some more info: EGGS WITH CLOWNS ON THEIR FACES