I think it would be a fun unit. I had my 4th graders use pattern blocks to "design" inside a square. Then I took a couple of them and made quilt blocks to match and showed the paper design and the real life design. They were pretty amazed. At the end of the year (after all the testing was done and we had turned in our books) we did line designs, talked about intersecting lines, acute and obtuse angles,concave and convex, etc then they would sew their design on poster board squares. They did stars, hexagons, octagons, hearts, and circles. They were amazing. There was some bloodshed, but nobody died(O: