Ok, so I am working on a map of a continent and I want to have create my mountains from a space viewpoint instead of the side view. I am working on the map in GIMP using RobA's tutorial, but was looking for a different map style. What I would like to know is if anyone has any pointers or references to doing a good overhead mountain view with shaded relief going down from a nice ridge line in an artistic style.

I "know" I have seen an example close to what i am trying to do, but I cannot seem to find a link

Though I am using GIMP, I would be more than willing to use any other free software as long as the results could be imported back into GIMP for adding into a layer that I could put new layers on top of...

Any pointers or links would be appreciated.