Sage-Gray Sage-Gray "Think of this as a Belgian gray, one of those moody colors. Sometimes it looks gray, sometimes sage, and at other times brown. It reminds me of wet cement, particularly when done in lacquer. It would be very handsome paired with chic brass fittings and a limestone surround." —Robert Brown C2 Paint Premium Exterior Woodpecker C386
I'd suggest keeping the walls white. But take one wall, perhaps the one that borders the hallway, and cover it in chalk decals or paint it in chalk paint. Your family can draw pics on there for C. And the richness of the black will look really nice with the other elements.