Below are some pictures of what I use for classroom management..
"A.R.T." - If the class, as a whole, is getting too loud or not staying on task then i begin flipping over the letters. If I have to flip over the "T" then they stop art class and we talk about their behavior. They can earn the letters back if they are doing a better job at staying on task.
At the end of class.. if it still says "A. R. T" then the class gets a crayon in their crayon box!! once they get 10 crayons they get to have a fun art day (free draw, art games, sidewalk chalk etc.)