This guide from the NEA website is a good overview of some tested Classroom Management techniques. These are general and do not pertain directly to the art room but can defiantly help dig you out of a hole if and when you find yourself in those less than desirable situations!
Fear not. Our survival guide outlines common and complicated classroom scenarios with strategies to navigate them with ease. We’ve teamed up with the authors of The Complete Worst-Case Scenario Survival Handbook (see sidebar excerpts) and a panel of your most adventurous and intrepid colleagues to provide tips and tricks for handling harrowing situations in life and in school. To get you started, we offer this strategy for safely surviving all situations, including this article: Keep a sense of humor at all times!
Read the full guide: http://www.nea.org/tools/survival-guide.html