Here are the photos of my Mexican Stars wallhanging that I did at quilt retreat #2.
The next picture shows a closeup of the 3-D effect.
All the white-ish triangles are squares folded in half. So when you fold the diagonal area back, it is on bias and shapes into a curve very easily. Not sure yet if I will sew them my machine or hand. Leaning towards hand, but still haven't made up my mind.