How about a tie border? Make two diagonal lines, 3" at bottom and 1.5" at top, with a square or V at top, at the smaller of the ends, so it looks like a tie. Then another next to it going in the other direction, so that one tie is up and next is down. You could even squiggle different lines on the ties to differentiate them. Would like to show a drawing, but don't know how. Hope you can vision my thoughts.