Start with the Finish
The room's metals don't have to match, but if they do, you get a design that simply makes sense.
Now, if you do want to mix a couple of metal tones, you can create a trendy look. Basically, it's about balance—a cool tone to offset a warm one. Think about how an attractive warm bronze, copper or gold light fixture will play off a cool, silvery nickel, chrome or stainless faucet, towel bar and pulls. Regardless of whether you plan to mix or match the room's metal effects, make sure they carry a similar look—curvy or streamlined, for example—as a visual connection.