I've been seeing lots of variations on the Notan Square lesson on pinterest so I thought now would be a good time to upload my high school lesson for notan squares. In the past I've taught the lesson and then students created one symmetrical and one asymmetrical design. The high school students really got into using themes (nature, weather, sports) going beyond just mindless snipping and gluing. I was always very pleased with their results. The ability to use exacto knives instead of scissors elevates what the designs can become.
Lots of the elementary ideas on pinterest look like fun and something I'd want to try next year.