I'd find a gray that matches one in your marble. It'll blend in more smoothly with the silvery color, whereas much darker or (Gawd forbid) white would just look like an 80s shower. Can't wait to see your kitchen!

Mine is venatino. I was told they come from the same quarry but are classified by appearance. The background of the venatino is whiter where the background of carrera is more grey. My slab has a mix of spots and finer dark veins with some more subtle broader ones. They reminded me of ink squiggles and blots on old parchment. I thought of da Vinci and I was sold. And in the end, that's really what matters -- finding a look that is special to you. No one else may see my marble the way it hit me.

I love white walls, and just went through this same decision. We went with Pearly White walls and regular white (whatever is on the shelf) for trim. It looks great! I also just finished (really, 10 minutes ago) painting a room Alabaster. It was my second choice for the kitchen, but it's a beautiful soft white for almost any room. If you can, paint samples on all the walls to see how it looks in different light. Or you could paint swatches on a large poster board to move around the room.

Here's a good overview, also from Houzz: [How to Clean Marble Countertops[(https://www.houzz.com/magazine/how-to-clean-marble-countertops-and-tile-stsetivw-vs~50954561)