Making PS2/Silent Hill Inspired Textures for Blender

[carlsagan666]

Hello. I've been 3D modeling in Blender and experimenting with texture mapping. 

Lately, I've been trying to render in Photoshop a very gritty PS2 resolution textured look and I'm not even sure what functions or techniques to begin with. 

Can someone point me in the right direction please? I've provided a few reference images.

 

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