Here is a way to keep the noise level down in your monster themed classroom. I have included Teacher Voice, Group Voice, Whisper Voice, and No Voice. Print out and attach a clothespin to show the noise level you want your class to be working on.
I've also included the letters to spell out: N...O...I...S...E. You can print out these letters, put magnets on the back, and attach to your board. Take one letter off each time your class is too noisy. When they get to NO there is no talking.