Walls

Were they blue before? I would say blue, but if that's what they were and you don't want that anymore, then I guess gray or white although you may have trouble finding the right shade. Look at the colors next to Classic Gray (darker) such as La Paloma Gray 1551, or use the color you've painted your trim. In general it's a good idea to choose the wall color last, so if the Classic Gray is boxing you into a choice you don't like, consider painting the cabinets a color you like and repainting the walls. There isn't a lot of wall area in a bathroom.

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They used to be brown. I like the Classic Gray on the walls but does a grey blue cabinet color work with them?

Navy Blue

I'd just repeat the "Classic Gray" in satin finish on the vanity. Or leave them as trim white . Leave the upper trim around the mirror as trim white with Classic Gray on the cabinets

Bring in any accent color you want in accent.

Failing that ? Re do the walls to Hale Navy, and either repeat Hale Navy in satin on vanity.....or leave vanity as Trim white.

Navy on the walls, actually, would be my preference. The room will look larger, and the tile will look cleaner/ brighter. By a T.O.N

Not to mention I am sick to DEATH of gray walls. : )