Love the floor! Blues would be beautiful. You could consider two-toned with a navy on the bottom to contrast the light floor and a white on top to open the space and brighten it up. Some beautiful, but very different, blues. You could also go white on the perimeter and blue on the island. Always a beautiful combo that would look great with your floors. The white would brighten it up and the island would ground it.

What's wrong with the wall color you now have? It is a warm gray from the looks of it on the monitor. And flooring should NOT be a change from the kitchen flooring. Continue it. Even via refinish to all other areas........perhaps a bit deeper, but you never be completely rid of the red undertone if that is what is bothering you. The red casts a tone on the mindful gray cabintery, making it read a bit cooler. Teh counter tops are very warm in tone. Maybe you can elaborate as to where you are trying to "go" beyond ridding yourself of carpet?

I do like the cerused look myself and its really what I initially had in mind as my stain. Its not a finish everyone offers, is likely to be an upcharge if it is offered, and is going to look best on a rift or quartersawn white oak which isn't cheap wood to start with. I'm happy with how mine turned out and everyone who sees it seems to like it. It's driftwood on maple with an black glaze. Without the black glaze, the pink of the wood showed through and was too much. It's definitely grey, but it has an underlying brown and slightly pink tone so its warm and not GREY. I think it fairly different/unique/unexpected. Would probably have been a bit much for the entire kitchen though, I'd be careful of using grey flooring though, it's such a huge surface can be overwhelming.

Go look at slabs in person. Some I thought I liked I hated in the showroom. I am not into the very large veiny quartz counters that are out now, I like simple with some small pattern within. We went with santamargherita vermont (opus stone) and are very happy with it. A subtle pattern and true white background, didn't want yellow or gray.