Cut the shorts, dip them in bleach, and use fabric paint for a pattern!This will probably be my last shorts pin of the summer. I would work with jeans as well though going into fall. You could bleach up to the knees for example.
Add fabric to upcycle shorts. Place fabric over shorts, trace outline of pocket + or extra, cut, then fold or place in pocket and sew (you fold that extra fabric so it looks like a professional seam). Then add fabric to the bottom and your done!