Mouse, the Layer Effects script adds a new menu under Script-fu called Layer Effects, which expands into a whole lot of different things including glows and stroke - only I don't really know what they do so I've never used them. I used the Bevel and Emboss tool once to make rivers look lower than the land, but that's about it. Anyway here's a page for it: http://registry.gimp.org/node/186
And that map is fantasticWheel ruts as well
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