Start by cutting all the Color 1
strips. As there are so many of them, you'll probably want to lay
them out neatly so you can easily grab the right strip when
needed...
Then cut all the Color 2 strips
and lay them out neatly...
Next cut all the Color 3 strips
and lay them out neatly...
Then sew together two Color 2
squares and one Color 3 square, pressing seams towards the darker
fabric...=Unit 1
Sew a Color 2 square to the
bottom of a Color 3 2-1/2" strip. Press seam towards
darker fabric. Add a Color 3 square to the bottom of that. Press
seam towards darker fabric. Sew a Color 2 4-1/2" strip to
the left of that, pressing seam towards Color 2 strip..... Make two
units like this...=Unit 2(s)
Now sew the Unit 1 to the left of one of the Unit 2's, having top edges aligned, and stopping your
seam 1/4" from the bottom. Backstitch and snip threads...