Since I am an Owl fan I thins that this noise level poster Is wonderful. It is very visual and it seems to be a very effective classroom management strategy to control voice and noise level in Preschool classroom.
I think this is a cute way to display classroom rules. There are only a few of them which makes it easy for the students to remember. If you come up with rules as a class this would also be a cute way to simplify them while keeping them manageable.