I will try to show you through this tutorial how to create a metallic looking texture. There are probably another hundred ways to do it so you must play around with layer options, blending options and filters, as well as your own imagination. The best way to create a texture is to have a real one nearby, found anywhere on the net. A good place to search for images is on Google's Image Search.
Now everything I did was done with Photoshop 7, and a few brushes that you can download for free.