I made a pattern like this once. I layered [what in this case would be 8] fabrics and cut using a paper pattern. Rearrange the pieces so each stack has 1 of each of the 8 different cuts. Piece together, use maybe a really thin bias tape, or non-bias, strip overlay to create the stained glass look, sash and viola! In my case I did not use the black strips, but used decorative stitches over the seams.