Click on the Create a New Layer icon at the bottom of the Layers palette to add a new layer on top of the copied Background layer. This is where you’ll add the border. Press B to activate the Brush tool, click on the Brush thumbnail in the Options Bar, and from the Brush Picker, choose your wide (horizontal) brush that you defined in Step Two. Click on the Foreground color swatch in the Toolbox to choose your color from the Color Picker (I used black in this example). Then, position the cursor along the top edge of the photo. If the brush is too big, press the Left Bracket key ([) repeatedly to make the brush the size you need. Click once to paint a border with your custom brush. Depending on the texture in your brush, you may want to move the brush slightly up or down and left or right, and click a second time. Repeat the process along the bottom edge of the photo.