My students love using their mixing bowls to keep their supplies in instead of using boxes or pouches.  They store them on their group's shelf.  The mixing bowls were at Dollar Tree.  I also have them put their unfinished work on a cookie sheet that sits on top of their shelf.  Each group tries hard to earn brownie points by doing a great job.  I printed brownies and put them on magnets.  When I see a group going above and beyond then I put a brownie on their cookie sheet that is hanging on their group's shelf.  The cookie sheet is attached with two sided sticky tape.  On the other side of the shelf I attached a small white board that I use to write down skills that the students in each group need to work on.  This is so that when a parent volunteer comes in to tutor they can just read the groups' white boards to see what each student needs to work on.  :)