I first learned about creating tessellations from our art teacher, who did an art enrichment period for a few weeks for each grade level every year. When that ended, she and I taught it together after-school one year, and when that sort of collaboration for after school clubs was discontinued, she was happy to let me take it over. I'm just glad our school has had the funding to do it the past 2 years after a couple years of no clubs!
For our club we start out looking at examples and definitions for slides/translations, rotations/turns, and reflections/flips. Then comes the art!
First we cut and paste tiles:
Then we traced tiles: