We'll begin this tutorial, by selecting the "Line Tool" at a size of 12 and changing the Foreground color to black. Draw a line and move the top right anchor point down by holding in the "Shift" key on your keyboard and hitting the down arrow once. Move the bottom right anchor point up using the same process.
Now that you have your shape, you can now right click on the layer and select, "Blending Options...". Now click on "Gradient Overlay".
You may now click OK.
You should now have the following.
Duplicate the layer and rotate as I have already done below to all the sides. You will also need to adjust the "Gradient Overlay" of each duplicated layer to fit the look of the frame.
You should now have the following:
The Results!!!
To finish this tutorial I added a previous render that I created as the picture and "Inner Shadow" and "Inner Glow" to the picture itself. I then added a rectangle moved it so it is below the frame layer and added a "Drop Shadow."





More Photoshop: