One we fitted recently in much the same tone. You'll get the actual White Levanto Marble sample in your hand at the visit.
The look
The marble people picture
White Levanto Marble is the one folk have in mind when they think of a marble wall. It's a warm white with grey veining that wanders across the surface, and it's marked out a good room for a long time.
We line the veining up across the doors and the fire face so the pattern carries on without a break. That's the part you don't get from a flatpack. Put it against dark slats and it's the first thing anyone looks at.
Black Oak thin slat behind it is the pairing we fit most, purely for the contrast. For something softer, Sinner Oak or Cloud Stone wide slat settles it right down.