Here is a fun group activity for artclass when you have a few minutes left of art time. I had a huge tub of crayons left on each table after our art lesson and I challenged each group to make a color wheel with their crayons. They had to dig for the primary, secondary and intermediate colors and then arrange them on their table before the other groups. I dismissed them when they got it right. For the younger kids I went over the color wheel, and told them there were 12 colors and I told them there wasn't any pink, brown, black or white in the color wheel. Have fun.