I can't help with color. I tend to chose "bright and bold" myself and that's a bit against the current popular trends. I will say this about the metal tub trim, for what it's worth. I had similar trim surrounding the main tub when we lived on the base. The Housing Office let me remove the glass doors - no way was I going to try to keep them clean - but that left the metal frame that hurt my foot every time I got in the shower, was the devil to clean, and was very uncomfortable to lean over and against in order to clean the tub. I got out the power screwdriver and removed all of it. Yes, it left a few holes along the tub, and three up each side of the tiled walls, but I carefully filled them with caulk and never gave it a second thought. The small filled holes were much less bothersome than the frame. There was no water damage, and believe me, before we moved the housing inspectors tried their best to find some, LOL. Since our house was scheduled for demolition once we retired, I did not have to replace the glass doors and frames that I had carefully and thoroughly cleaned, wrapped, and stored in the basement. So if you don't like the large expanse of gold trim around the tub, and you don't mind a few dots of caulk, remove it. You'll more than likely be very pleased with the results. I have that very same cabinet over the toilet in our basement bathroom. It's as sturdy as can be, very well made, very useful, etc...so I just decided to embrace it's '60s glory and use it as is. You could change the handles and switch out the sink faucet. Once you pick a paint, remove the tub trim, and maybe change the faucet you can just celebrate having a functioning and not-bad-at-all bathroom.

Trend, as far as I can judge, is gold, copper, and flat black. Of course other finishes are widely used by most. But I wouldn't worry about trends so much. What I would worry about-is how my chosen finish going to look like. For example chrome or nickel look good both in cheaper options and in more expensive ones. Brass or gold or oil-rubbed bronze can be extremely beautiful, but then they would cost more. And if they are cheap they sometimes won't look that great. I think some level of mixing finishes is perfectly acceptable, and can ever be extremely beautiful at times, but requires confidence and good eye. But if for example you are going with dark levers, black or bronze, and the hardware in bath is pewter or nickel-I think it will work. If levers are black and hardware is brass-would also work. Now, mixing "silver" finishes and gold ones-here I'd be more careful, because that's much harder to pull off. My preferred finishes are copper, polished nickel, antique silver, antique brass, pewter..all of these usually require special order and longer lead time, just something to keep in mind. I went with polished nickel in master bath-frankly, if I knew it'd be such a pain, I'd reconsider. As for the contrast-I think bronze or black would look amazing with white doors. Unless you have doors that you dislike so much you'd rather unsee them..:) I hope to see other answers here too, choosing hardware is an interesting topic.

I am doing navy cabinets in my guest bathroom remodel, and we’re going with brushed nickel hardware, I like the look of the brass with navy but my whole house (including the door hardware which is very close to the cabinets) is already either nickel or chrome and I feel like I should keep it all in the silver family. I don’t think you can go wrong either way but I decided to keep everything cohesive.

@Patricia ColwellWe are doing a total gut so we can start from scratch with the valves and are constructing the wall they are going on. @Sabrina Alfin good to know about Moen. I'll stay away. I like a number of Brizo valve trims but when I saw them in person at Ferguson showroom I could not belive how far they projected - I think 8". (My husband and I both thought they looked like big you know what sticking out of the wall!) They don't show that dimension on any of their specs online. Am I correct in assuming if I need a diverter, volume, and heat control, I either need to have 3 separate trim pieces taking up a lot of visual space vertically, or need to have them jutting out of the wall 8" on the same piece? @chispa I'm quite sure the volume will be turned all the way up no matter what because being on the 12th floor of an old building means such low pressure that you need all the volume you can get. That is why at first I thought to just get pressure balanced - we have one in one of our bathrooms and just turn it to full heat and full pressure. But now I wonder if I will get more hot water out of a thermostatic than a pressure balanced?