very cute mirror. I don't have ideas. What have you looked at? For me, I would use a warm finish to go with the nickel, as the nickel I've seen is always a slight golden color. So any nickel that has that golden tint to match, or a dark bronze. When I did my bathroom, I had chrome fixtures and went with chrome for the light and a cold colors metal in the knobs. The mirror is a Hubbardton Forge mirror in their natural steel or the dark smoke. They are cool colors.

Will you be shaving or applying makeup at this mirror? If so you need some bright light. You could put it on a dimmer if you'd like.