Here's another thought, depeding on how well your artistic skills are, you could try painting the fascia to look like a stone wall. Or maybe something else that would look even more realistic is if you did what Casey Feedwater did and build a rock wall out of plaster. I think that the overall thickness of the plaster was actually thin, just enough to cover the front of the material he was covering, and then he carved the stones into the wall. It is very impressive and realistic looking, I beleive his thread is in the acadamy titled Stonewallin'. It would probably look pretty good in most places, but after going around the entire layout, it might get old. You could use a variation of things, stone wall, tall bushes, rail tie retaining wall, tall grass. Don't know if this helps any.
Freelancer