In my orientation, we discuss student stereotypes with my assurance that I have been all of the stereotypes! We address common issues: the know-it-all, the shy person, the mumbler (someone complaining under their breath)...it has beens successful because I explain that highjacking the learning experience of others won't be allowed and students will be asked to leave if they engage in highjacking the room or hurting other students' learning opportunities. With that said, I like your colored-cards for talking - that might help the shy folks as well.
