I think it's for 'artistic effect'. I sometimes print similar borders, especially on my square images. I think it finishes them off, but I suspect others don't like them. I won't go into my own method, but essentially you devise a system of printing the border onto the paper so that it is developed at the same time as the image. My technique involves exposing the border first via the easel and then the image. Some people do it using the negative carrier. Alex