Any tutorials/advice for making detailed cliffs for dimetric graphics?

Any tutorials/advice for making detailed cliffs for dimetric graphics?

Ideally, I would like to make cliff graphics as detailed as the ones found in StarCraft, as shown in the figure below and link to full sized image. I suspect that I might have to make "high" poly cliff models in Blender and render them, but I'd like to know if there are any simpler/faster methods that can produce similar quality results as StarCraft.

StarCraft Cliff Example

http://i.imgur.com/5X3Gb3m.png