The first class we taught was decorating a Color Catcher by Clearsnap. If you haven't seen this new product you can't live without, let me explain it to you. It's an easy to assemble, compact cardboard spray booth, designed to use with Smooch Spritz and similar craft spray products. You can use it right at your craft desk, and not overspray onto any other work surface. The one we made in class looks like graffiti sprayed alley, complete with a clock and hopscotch board.
Here's a photo with me and some of my students while they were working on their projects.