Textures created on steel surfaces (including leather)

This is a video I found on youtube of creating different textures on steel. I found this both fascinating and relevant, since a large portion of my model is made out of steel. The man in the video then proceeds to create a leather texture on the surface of the steel, which is another material that is greatly used in my design.
(As stated in the video description on youtube, this is not my video, nor do I have any claim to it.)