Thanks for the comments GP.... so far all of your observations were spot on!

In this next version I: 1) finally figured out how to make a grid (newbie stuff, I know); 2) changed the overall color of the map (my wife looked at it and shivered, "too orange!"); and 3) removed the grunge strokes around the walls and instead applied RobA's crosshatch around the walls and feathered it out.

Problems I can see: 1) the wall corners now have a little glow overlay to them that i can't seem to get rid of and makes them look beveled to me. I really dislike beveled and embossed walls, but this won't be an issue a little later on when I hand draw the actual walls; and 2) the grid just isn't everything I want it to be... I don't want the tiled look, but I'd like to figure out a better way to make some parts fainter with a little more "personality"... just looks a little "pre-generated" to me.

All-in-all, I'm growing happier with my progress

Here is Step 3:
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