When I taught school, we had extra copies of a Scholastic art magazine. I purchased some business card self-adhesive magnets from an office supply store. I cut out images of famous artists' work from the magazines and attached them to the magnets. I put the magnets on the chalkboards and used them to hold examples of projects, student work, etc. I just happened to have a few of those magnets lying around. I did the same thing with one of Tater's mixed media drawings. I'm think about making a few more of these for the grandparents.