I so rather make these than tie dye shirts. First bleach the shorts then buy different color clothes dye. Dip part of the short in at each different dye, do the middle first. You might have to bleach the stuff you colored while getting the middle
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.