In an effort to personalize the rule posters, I cartooned my self and used it for the picture on the "keep your dear teacher happy" poster. I think that brings the rule home a little more, plus it's fun for the kids to see their teacher as a cartoon. There are tons of websites to help with that, including one where you can make yourself into a superhero (
www.ugo.com/channels/comics/heromachine2/heroMachine2.asp) but the one I used is here: www.madmenyourself.com. It looks pretty much like my profile pic, but without the beard.