People also love these ideas
stress ball balloons (have the balloons created, let teens take a study break by 'creating' a face using the extra overhead/transparency markers I have (that way Sharpies aren't out at this 'large' event))

I came across stress ball balloons when I was reading Positive Parenting . The author suggested a few alternatives to spanking and stress ba.

Free Graphics, Vector Graphics, Icons, Blue Flowers, Swirls, Ethereal, Cookie, Blues, Biscuit