This mod makes Geralt look like one guy you don't want to mess with by giving his gear a darker theme. Geralt himself has even undergone some improvements to make him look more appropriate to the lore. Everything from his clothing, his swords, his eyes, and even his scars has been improved upon.
This is the full download for the Dark Geralt Mod which contains all required files. Refer to the readme.txt for installation instructions.