Using the suggestions from the 1981 Palmer/Pletsch pattern I went on a hunt for potential back pocket designs. Of course, I did the easiest thing: I googled "back pocket designs". Here's what I came up with as potential designs for the jeans I'm making from M5515. This pattern does not have back pockets so I used the back pocket pattern from the 1981 Palmer/Pletsch pattern.
Copied lines to pocket using tracing wheel and paper:
Went over lines with tailor pencil:
Next Sewing the design onto the pockets.