It dawned on me last night that it might be cool to take a destroyed Himmelveil Streets wall and layer on some of the grass from a Hinterland Cliff wall, making it blend in more with the overgrown remains of an ancient city. Here's a sample:
I still need to work out the posts, but that should be easy. I made the wall in two types - a full 6", and these above that are broken in half, allowing for shorter ruined walls. I might go a step further and make some "prop" walls that have Hinterland bases and are free-standing.