I too googled it and could not find it. It would be easy enough to draft it. You already know that the white was jelly roll strips and the blocks were made from 10" sqs. The L appears to be the same width as the white. I would cut off two 2.5" wide pieces from the 10" sq (that leaves a 7.5" sq) Sew on your white strips, I would probably add a 2.5" sq of white to the ends of the L strips and trim to fit, That would end up being an 11" block - Then add white sashing.