Painting Challenge

I saw this idea on Pinterest and decided to give my third grade students this challenge and they loved it.  Here is the link where I saw the lesson:  http://www.teachkidsart.net/mixing-100-colors/.  Each student was given the primary colors plus white and asked to see how many colors they could come up with.  At first it seemed impossible but once they took a look at the color wheel and were reminded that they could mix different shades of colors they were off and mixing up a ton of new colors.  They really had a blast and learned a lot about color theory.