Check out the Magnatiles blog for some fun and meaningful impact and play. Includes some PDFs to print out for you and your students to enjoy.
Who doesn't enjoy magnatiles?!?! If you have not checkout their website, it is worthwhile of a glance. It will provide you with print out for your students to show them how to make creations, such as a rainbow. Really fun to check out!
Embedded below is a 1 minute and 20 second YouTube tutorial.