Light fabric: cut 2 squares @ 3 7/8 inches. Cut these squares in half once on the diagonal.
Medium fabric: cut 4 squares @ 2 3/8 inches. Cut these squares in half once on the diagonal.
Dark fabric: cut 4 squares @ 2 inches
Sew the 2 3/8 inch medium fabric triangles to each of the 2 inch dark squares as shown in the picture below.
Arrange these triangle/square units with the 3 7/8 inch light fabric triangles as shown below and sew together.
Go here for the finishing instructions, keeping in mind that this block has the dark large triangles on the outside.