Mapping advice?

[Damascus]

I realize this is very vague, but I'm facing a major dilemma with my mapping at the moment. I've almost fully mapped out the next area for The Great Work, but am just not happy with the way it looks.

The map in question is a cabal that has been built underground, out of stone and brick. It's still being used, so I figured any of the more dilapidated bases like Dungeon would work well, so I decided to use the grunge brick set that Measuring made. Here's the result:



My intent is to make a central hall where the cabal meets in a sunken pit, and the cieling is extremely high, with passageways that wind up around it and cross over it on bridges. My main problem now is with how very... bland it looks. The grunge brick set has limited set pieces to work with, and I feel like I could flesh out the shaping of the level by using something else like Castle instead, but I'm afraid it would totally change the environment.

I don't want it to look too much like a castle, but rather like a dungeon without it looking abandoned or very old. Would switching to one of the other bases be acceptable here? What would you do in this situation?