Hey guys, great ideas!
I'm afraid that the blender trick wouldn't work in this case because I have so many classes that I am doing this with.
BUT the wall spackle is a great idea. I am going to the local hardware store tonight.
I am also going to try the dough idea and make a dough out of paste/flour/water and see how well that works.
Any other ideas? Tonight is my test night! :-D