I tried my best to keep as much features in the monsters and textures as possible, so that they look less like brown misshapen horrors and more like the monsters they're meant to be. I have considered just making the entire thing fullbright, but I quite like how some objects and textures look in the dark. The small wad file only includes Hexen's Palette, Colormap and Fogmap files, mostly edited with a later version of Slade.
Some screenshots:
Spoiler:Feel free to criticize! If you somehow enjoy it and want to use any of it for any reason, feel free to.
Download: https://drive.google.com/file/d/0B2y_-q ... sp=sharing