Now pair up the Color 1 and Color 2 2-7/8" squares right
sides together with Color 3 2-7/8" squares. On the back of
the top squares mark the diagonal. Sew 1/4" away on each
side of the drawn lines. Cut apart on the drawn lines. This will give
you two half squares in each color combo. Press seams to darker sides.
These should measure 2-1/2"...