We use cushions (the simple, flat ones that make a hard chair more comfortable) for each student.  We cover them with material and then the students decorate them with their name and other designs in fabric paint.  We have a lot of students who come only occasionally and this lets them know that there is always a place for them with us.  We also have a couple of Visitor cushions for guests.  When people move away or graduate, we recycle the cushions by recovering them with fabric.  We found the cushions made a huge difference in keeping wiggly students from becoming noisy disruptions.