At Women & Their Work years ago, we ordered paper fans (the type that were used in unair-conditioned churches and funeral homes in the South) and one of our artists silk-screened a design that said "Art Fan"... it was a huge hit. She is now famous, and everyone who got one has kept it! Mine hangs on the wall in my den... I could never afford another piece by this woman! I don't know where you can get the fans, but you could get door hangers from Papers Direct and have an artist design something that said "Do not disturb... visiting with the muses." or something like that. I think having an artist involved would be more meaningful than anything you could buy for these volunteers. If your program works with kids, why not have the kids design refrigerator magnets?