Originally Posted by ghostrider

And if you want to play more games with those shapes, you can make tessellations on this interactive website. There are three types of interactive grids, along with numerous types of grids that you can print out to work with (click 'grids' on the top menu to see them). They include the usual square, triangle and hexagon sheets, plus combinations ranging from hexagons/triangles to dodecagons/hexagons/squares, pentagons, and waffles. It's all great fun!

This is the Escher-style interactive page.
http://gwydir.demon.co.uk/jo/tess/sqtile.htm