OK- I love the idea of this project. And in an effort to boost the behavior of my 3rd graders, I held an after school art, to which I invited my best behaved to join in the shaving cream fun. My thought was that the word would spread, and the other kiddos would shape it up in an effort to get an invitation. It turned out ok, but not as well as I saw from other examples online. Did I not use enough shaving cream? Did I give them too much space to draw the marble on? Should I have limited their designs? Is this how it is supposed to look? 2 kids got perfect marbles, and the rest got mush. I just wonder if I did something wrong, or if this is just the success ratio typical for a project like this. Or, am I just being picky? Thoughts? Also, any other messy type projects that would be a good incentive? I'm leaning towards clay for the next time.