Hexagon-square-triangles, attempt 1
I think this would be better with slightly longer tan pieces; then it would fit together better. To make the tan bits square again, as they are in the source material, the hexagons would have to be larger too. Hmm. I thought it'd be okay to try to approximate the equilateral triangle within a larger equilateral triangle by using the red circles. It's an approximation.
Copying from an image on this page of The Grammar of Ornament, but my copy has brighter colors, which is why the triangles have the red bits in them.