You might want to check around for some conversations on that black tile. I've seen some conversations of complaining the matte black shows a lot and can be difficult to keep clean looking.

I do not care for black or dark charcoal tile but that is my preference (i like the look at a restaurant but would not want it at my house). You could just do similar tile that is there but in a different color to your liking or what you feel someone else will like. I tend to shy away from the trends as I try to match the era of the house. My last house was traditional so i picked many traditional design elements. Current house is more mid century modern, so I leaned that way when we were remodeling.

I know you said you wanted to stay away from gray, but I think a gray bathroom floor is very practical. Very light or very dark colors do tend to show dirt and hair easier. There is a white floor in the secondary bath of the house we moved into four years ago and it is terrible. I put a medium gray slate look porcelain in my primary bath when we remodeled a couple years ago and I have been very happy with it. I have brown and gray hair and neither show. :-) A lot of different colors go with white and gray so paint the walls something else like blue or gray, dark or light, depending on what you like, and get towels to match. Not everyone likes art in their bathroom, but I always put some in. As long as you have and use a good fan you don't have to worry about moisture.

Or just use a patterned tile if you really don't want gray, but don't want to see every fallen hair. While I agree with you that real marble is not a good choice, there are porcelain look alikes that you could use on the floor as well.

Mid-Century Modern Primary Bathroom Remodel / Alexandria, VA · More Info

In a bathroom, I absolutely would not use a dark tile, especially if it is matte. Every drop of anything, every bit of powder, hair product, hair, skin flake, will show up.

Agree. I have black slate in my master. It. Shows. Everything. Every hair, every speak of dust, any errant floss fling. Never again.

I really like Kendrah’s suggestion in her comment. Personally, I would rather have that floor tile than matte black or a white tile. What will your new white vanity look like?

Agreed, I updated my post with the lighter colored tile that I've decided on https://www.tile-shop.com/products/tropical/tropical.html

8 1/2" hex Bianco Porcelain.

Many thanks, everyone! I'll post final pics whenever the job is complete.