I think that the best way to make 3D game textures is 1) to take real images and then 2) to use Photoshop program to modify these real images. However in some cases, I create game textures using Photoshop. I also use Photoshop for drawings with Wacom tablet. Any way, Photoshop is very powerful program for me to create or modify game textures.
In this game texture design section, I will demonstrate how to create some useful textures in games using Photoshop.
LIST OF TUTORIALS
Tutorial #01: How to create metallic texture I
Tutorial #02: How to create metallic texture II