Thanks iDad, you are correct in that it is constructed with a layer, in a blending mode. But the reason that I suspect a plugin is that these two images are from two separate artists and one of the artists has quite a number of images like this, where certain shapes seem to be outlined by this beaded or jeweled pattern. I am guessing that the plugin follows areas of high contrast in an image and generates these tiny bead-like forms along the outline. I was just hoping that someone was familiar with this plugin. I have been combing the lists of plugins and haven't been able to spot it.