My 5th graders created wonderful Tessellations. They also learned a bit about geometry in the process (wow, teaching math the fun way!) I created this PowerPoint to introduce them to MC Escher and the concept of tessellations. I taught them how to make their 'template' or 'pattern' then turned them loose.
This lesson was built on the lessons they learned in 4th grade when we did the Isometric Perspective and the Tiling lessons (also sold through this site).