Simple Cartography Map Effect (Photoshop Action)

This is a simple action I created in CS4 based on a tip I posted here www.youtube.com/watch?v=zj1NxF… - you can follow the video to modify the settings or just use the action. In the sample image you can see the action applied to some simple brushed shapes,  Render/Clouds layer, Clouds plus stamped with a brush, a Custom Shape from Photoshop and even a maze I downloaded from the internet. You need to use good contrast/dark areas if you want to retain the shapes - too light and it gets whited out.

You can see an example of this action being applied to some simple brush strokes here. www.youtube.com/watch?v=Hb49lD…

Please let me know if you find the action useful.