You could literally write a book on metals and metal finishings. There are that many combinations and looks to show and describe. Attempting to describe them all, including the more recent high-tech finishes, would be too much to explain here. So, we'll just talk about the high-tech ones that produce some fascinating results.
Hammered any-metal is a fascinating enough finish. Always decorative, always eye-catching, hammered metals invite your touch along with your visual senses.