Sometimes you might try to create something using Adobe Lightroom and find that its' lack of layers stops you - in this case adding a ragged edge to an image. Here's a quick tutorial on how to add an edge using a .png file specially prepared for the job that is then imported into Lr and applied using the Print module's Identity Plate function.
Lightroom Ragged Edge Print from Robin Nichols on Vimeo.
It's very hard to try an import this as a Lightroom preset - but here's a quick How To tutorial for adding a dark (vignetted) border to the image - as a preset - so it can easily be used again and again...
Lightroom Vignette Preset from Robin Nichols on Vimeo.