The Washington Post is having the third annual Peeps Diorama Contest. They want you to make a diorama of a famous occurrence or scene or concept. It can be a historic, current or future event. It can be a nod to pop culture. It can be an evocation of an idea or abstraction. The one rule is that all the characters in the diorama must be played by Peeps, those marshmallowy chicks and rabbits plaguing checkout lines in every convenience store this season.