Comic creator Bill Zimmerman has a fun comic strip creator, MakeBeliefsComix. It gives you 20 characters, 25 objects (like flowers, books, phones, hats), talk and thought balloons -- all of which can be re-sized, flipped, moved, or an object brought to front. Once you create a 2,3,or 4-panel comic strip you can print it or email it.
It is a cool tool that can be used to bring humor, yet communicate rules (like this is a "Quiet Zone": Readers at Work), issues, or other bits of necessary information. It could also be a way for students to be challenged to tell a 3-4 panel story -- including who, what, when, where, and why. Enjoy.