This mod is called Dark Quake 4, change the textures of most of the game, the monsters are other skins, the weapons have new colored textures, armor is blue and more.
Dark Quake 4 mod Release Notes:
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Version 0.1
Author: Benjamin Pulido
Web Page: Benpulido.webs.com
Email: benpulido@hotmail.com
Install:
Extract the pk4 file to Quake4/q4base or create a folder called DarkQ4 and extract the pk4 in the inside of the folder and load the mod in the menu.
Building mod time: 2 days
Enjoy!