cut 4 rectangles 2 1/2" x 4 1/2" from a dark fabric
cut 4 squares 2 1/2" from a medium fabric
cut 4 squares 2 7/8" from a medium fabric
cut all 4 squares that measure 2 7/8" in half on the diagonal once to make half square triangles
(for a total of 8 triangles)
cut one square 4 1/2" from the medium fabric
cut 4 rectangles 2 1/2" x 4 1/2" from the background fabric
cut 4 squares 2 1/2" from the background fabric
cut one square 5 1/4" from the background fabric
cut it in half twice on the diagonal to make 4 quarter square triangles
layout as shown
sew together
and square up to 12.5".
Any questions, I'll try to answer them in the comments.
Thanks for quilting along with me!