Quiet Critters want to sit on your desk, see what you're doing, and get smarter. (Could remove them from the chatty students; those who still have their "critter" at the end of the "quiet" time could turn it in for a small reward.)
Label for a (plastic recommended) bottle of quiet creatures pom pom critters. Let these little monsters come out and sit on the desks of your students. They only get to stay there as long as the students are quiet! All students with critters at the end of a quiet activity get a Dojo Point!