Okay, I have some free time to refresh my tileable textures creation skills. I have started with more complex texture, but Photoshop crashed on me before I have saved my work.
Then I decided to choose less complex metal texture from CG Textures free collection: http://cgtextures.com
Here is preview of final texture rendered with use of displacement:
CrazyBump was used to create Displacement and Specular maps.
You can download final Bronze Copper Metal texture here:
It’s 1400×1400 resolution .TGA files.
Diffuse, Displacement and Specular maps are included.
Additional examples of CrazyBump usage for displacement maps creation: