What else was I going to do with triangles, squares, and heptagons. This pattern was based on taking a clock-wise loop of ten heptagons (it's like a loop of six pentagons--not very circular) and unraveling it with a clock-wise loop of triangles and a clock-wise loop of squares. That is what makes the octagonal shape that surrounds the "S". So then it's just a matter of a little decoration and tiling. I'm surprised no one has really blasted me on my choice of colours. Bring the flame war on!