I hope we got your juices flowing. I guess we were looking for a bit more information. Is this staying in the classroom? You mentioned something about an auction? It this being auctioned?
Don't know if I said this before, but they could also sign along the edge (with gold/silver paint pens) -(Wal-Mart has for Christmas cards and so does Hobby Lobby then put green,red stars, trees, bells, holly (small) between each name.
Please do let us see your finished product after it's done. I think you'll have alot of fun either way. (don't forget to send them all home with a candy cane) :)