Finally a time to try this edible art lesson & it worked! I was very nervous about knowing how much food coloring to use in the icing, thinking I'd probably have lots of brown icing among the kids. Alas, the fretting wasn't justified. The icing colors were very forgiving and the desired results were easy to achieve.
Also, our grocery store had "mini" vanilla wafers, which delighted me, since I had no idea how many regular size wafers would be in a box. I wanted every kid to have their own color wheel, so that meant 12 cookies per kid. One box of "minis" went a long ways. (FYI-I'd estimate there were approx. 175 mini wafers in one box.)
Each student was given 3 regular size wafers for the primary colors, and 9 minis for the secondary and tertiary colors. They also got 3 blobs of white icing, and 4 drops of blue food coloring in one, 4 drops of red in other, and 4 drops of yellow in last blob.
They created their color wheel, then decorated "graham cracker" canvases with icing from their wheel.
Here's more about edible color wheel lessons if you want some hints from other teachers who've done this with their students.
Students painted these graham crackers using toothpicks.
Below you can see that I gave kids a color wheel, cheat sheet too for this one. (Reinforcement, reinforcement, reinforcement.....)
It was fun!!