I wanted to show you a new product that I tried and loved the results. I ordered ArtEmboss Aluminum Sheets from DickBlick. They are 9-1/4' x 12" and come in a pack of 12. I didn't know what to do with them at first, but got inspired last week when all the leaves started turning, and decided to use it in a lesson to teach about warm and cool colors, and also using lines in drawing. All you need is a good selection of warm and cool colored Sharpie markers, a soft pencil (we used Ebony pencils), a piece of soft cardboard, assortment of fall leaves, and the aluminum sheets.
I collected a bunch of leaves in different shapes and colors and had the students trace the leaves on the "back" of their sheet. It will emboss better if you place a piece of cardboard under your work space.Then turn it over and begin to color, giving instructions to use warm colors for the leaves and cool colors for the background. Also make sure students are careful not to color over the "raised" portions so that they will have the silver lines define their shapes. I did this project with 2nd and 3rd graders and it took about an hour. Stunning results! Reminded me of stained glass windows.