Spin Art

There are many ways to make motors drive a turn table.
Example

http://www.picocricket.com/motion.html
Worm gear on motor divers 8 tooth gear on square motor

8 tooth driver on old motor and crown gear

or on newer motor.


See the following for other ideas
http://www.pienetwork.org/a2z/m/modules/

Use markers or paint.
Links of Linda Hamilton hamilton@marshall.edu
Using LEGO® Educational Materials