Just start filling in the gaps with your 2 fabrics. I would sew alternating piano keys strips for the bottom of the right side with the zig zag going vertical. The the upper left of that block, I would fill that with that corner with the black zig zag, Underneath, I would stitch a black strip and then an orange strip. Just preview which of the fabric will look best. Measure the gap and then add you two 1/4" seam allowance. JUST HAVE FUN !!