Using the same (EASY) technique I write about in the previous entry, I also made this. I
For the above photo, instead of using a shape for my black clipping layer, I just painted with a large, rough brush on a transparent layer, and made sure the color was black. Then I ALT clicked the line between the black layer (bottom) and the photo (top).
If you want an edge other than standard Photoshop brushes, this gal has quite a few she offers for free (and others for a good price). Or, you could make your own.