So this year I am using the "Brownie Points" idea I saw on Pinterest. Like the one on here : http://firstgradesweeties.blogspot.com/2011/08/classroom-tour.html So I had hoped my whiteboard was magnetic, but it isn't. So how do I attach the cookie sheet to the wall with out causing damage to the wall? I tried zactac bit it didn't work. It fell down after only 20 minutes. Ideas anyone?