SWEEEET!!!! This "rusty and distressed look" is awsome!!! nice work!!!Hi, like most things there are too many different techniques to describe them all so I'll ask a couple of questions to focus what exactly you're looking for...
What kind of scale and size are we considering?
Do you want it to tile?
oh, do you want it 'clean and shiny' like aluminium, or 'rusty and distressed' likw this: