||Now sew Color 2 half square triangles to opposing
sides of the block's center square, and then two more triangles to
the adjacent sides. Press seams towards triangles.
Next place a Color 1 small square right sides together atop a
Color 2 corner triangle, with outer edges aligned. (I show them
slightly staggered here) On the back of the top square lightly mark
the diagonal. Sew ON this diagonal marking. Cut off the excess seam
allowance. Press the remainder towards the small triangle. Repeat
this with another Color 1 square on the other four corners...