What about a pewter finish for all of them? Would look great with those GORGEOUS counter tops and wouldn't be as stark (or as warm) in contrast with the greys in the counters and white cabinets (as ORB would) or the brown ones (as BN would) . It would blend nicely with the BN, I think.

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Those are some gorgeous bathrooms and I think the orb on the vanities would work well. In theory I don't usually care for mixing finishes much but in reality I think this could look nice. I am not sure I would vary the finish on a faucet and lighting, but for the vanity hardware I think it's totally fine.. In our guestroom bath I have all chrome. The dark vanity came with orb hardware which I changed to chrome. Truth is, it would have been fine without changing the hardware.

I wouldn't do ORB because it is warm and everything in your bathroom is cool.

Personally, I would do black. Otherwise, brushed nickel.

Look at Top Knobs. They have a beautiful selection of knobs and pulls. And try to see anything you like in person; try to find a retailer so you can see the pull/knob in person.

I'd keep the knobs the same as the fixtures. The gray tones work so beautifully with your granite tops, so why not?

Gorgeous vanity tops! (No suggestions for you, but had to compliment your choices!)