I made my hexis myself using the plastic template material from my LQS. I punched a hole in the center where you can pin the material to the hexi and then stitch around the side to secure the fabric in plate. And, I also learned that you shouldn't take the plastic template out until the hexi is surrounded on all sides. My hexis were about 1 1/4" across.
I made a grandmother's flower garden with my hexis. ... queen size. I think I counted about 3000 hexis in that quilt. I still have the 300 or so plastic template hexis that I made.