I did manage to change a few things you all mentioned, so the map looks a little different in the most recent compile. I went for an "earthier" brown lighting, changed shadow colors a little, changed water color and texture, and reduced HDR brightness, along with the majority of graphical glitches. Here's a sample, and more can be found in my portfolio.
This version will be included with Insurgency 2.1 RC2, which comes out today.
http://www.insmod.net
What do you guys think?