First we'll speed piece the half squares, by
stacking the Color 1 and Color 2 3-7/8" x 7-3/4"
strips, right sides together and all edges aligned. On the back of the
top strip, lightly mark the 3-7/8" square line and mark the
diagonals in the direction shown at left. Now sew a scant 1/4"
above and below the marked diagonals, pivoting at the square line. Now
cut apart ON the marked diagonals, and on the 3-7/8" square line.
This will give you four half squares. Press seam allowances towards
the darker fabric. Trim these back to measure 3-1/2" if needed...