Flat Braid join

I've been thinking about how I want to join these squares and what color I want to use. I usually just whipstitch the squares together into a strip, then use the whipstitch to join the strips together. But, I've been thinking of using a method that will add some interest and texture to the joining. Yesterday, while reading my many group digests, someone suggested the Flat Braid method, and I thought that might be the way to go with this afghan. So, I was thinking white or the Plum Pudding. The white would go with all the shades of purple, and the white, because I have edges in 4 different purples, white and the Plum Pudding. I thought using the PP might be too much color, you know - a variegated joining on a variegated border. So, I'm trying this joining method with the PP and with white.