Step 15 - Duplicate and Style
Once you hve made the first one all you need to do is go to [Layer - Duplicate Layer] this will then duplicate the layer for you. Do this as many times as you want to. Aslo to get the black border around the images just right click on the layer, select blending options. This will then open up another box, in this one select stroke. Just give it something like a 3px border.