Not too long ago, I posted my reimagination of the old 2e undermountain map, and now I'm actually attempting to decorate the entire level… leaving no room without details.

On the image "link to image in comments since it apparently was deleted from this post": all the colored areas are places I was able to find official material for throughout the editions. I can't share my notes for these areas (due to copyright) but know that I have just about 99 pages for this level in my personal docs setup for this adventure. 

I need help figuring out what special and unique rooms you think would be an awesome feature to some of the empty areas. There are plenty of room to go around so im going to do my best to include ALL suggestions in the final result of the map :D