Collaborative art projects that are easy to do with lots of people. Jenn Hassin (Rolled Paper): Jenn had kiddos each make a few pieces of rolled paper then hot glue them to a large board in a fun pattern.
A color wheel explains how colors relate to each other and which colors will look good together. Nothing teaches you as much about color mixing as creating your own color wheel. Take a look at these Creative Color Wheel Project Ideas.