This is another technique that involves creating a path and then painting along that path to create a border. The first part of this technique is the same as the previous one, so the first four steps will look suspiciously familiar if you’ve already tried that technique (except that I chose a different brush to begin with in Step Three). So, if you did, pick this one up at Step Five.
Press Command-J (PC: Control-J) to duplicate the Background layer. Then ...