At my school we have a christmas tree (to fit the holiday) called the invisable backpack tree. The story behind it is that everyone carries an invisable backpack with all their problems and worries, so the point of the tree is you have paper ornaments and people can anonymously write their problems and worries on there and submit it into a box. After that you can hang them on the tree and as people pass it they can see they are not alone in some of their problems! Hope that helps!