This texture was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
This filter has some very different usages. It was basically made to render metal, especially molten metal. But after playing a bit with the parameters, I was able to render hammered copper as well as crocodile skin (well ... sort of). Enjoy.
Molten, Metal, Gold, Silver, Hammered copper, crocodile.