I was in your shoes last year. I had saved the labels from men's shirts I used in quilting and wanted to sew them randomly on a sweatshirt but. . . ALAS, it was too short. I took left over shirt squares and sewed them along the edge on the diagonal overlapping about 1/3 to 1/2. I didn't finish the edges as it was just an experiment but it turned out great.
What I would do is take two little blocks of each next or continuing bargello print from the line in the jacket above and continue the line down by sewing the 2 blocks right sides together (three sides) to finish the edges. Turn and press then attach each raw edge of each block below the appropriate line. You wouldn't even have to make them even since it's bargello. You could either leave that inside seam along the bottom or bind it inside to finish. That would just continue the bargello effect.
Last edited by mhollifiel; 11-22-2013 at 05:57 AM.