So one effect that I see a lot of in maps is bevel/emboss to pull walls out of the background in dungeon maps. I personally don't like it so I chose not to use them in my own maps. I wanted to create a nice edge effect on dungeon walls without having it look like a photoshop filter. In this tutorial I'll walk through how to use paths in photoshop to create nice edge highlights and shadows on walls.

In this tutorial I'll be creating this simple one room:
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Here's the psd file if you want to look at all of the layers used to create this:
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And here's what the same room would look like with the walls done with bevel and emboss:
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This is a quick and easy tutorial, so if there's anything that makes no sense give me a shout (or a pm) and I'll make sure I explain it better.