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Other
Tessellation World of Makoto Nakamura
There's more to do here than just look at Escher-like tessellations. You can watch animated tessellations and put together puzzles.
Primary Resources
Primary Resources: Patterns and Symmetry
Teachers, here's a great resource for worksheets and presentations about symmetry. Includes PowerPoint and smartboard presentations.
PBS
Pbs Learning Media: Triangles
In this video segment [2:01] from Cyberchase, the CyberSquad finds that by arranging triangle tiles they are able to create a path that will allow them to cross a river of hot lava.
PBS
Pbs Learning Media: Squares
The CyberSquad builds a raft out of squares in order to cross a river in this Cyberchase video [2:05] segment.