Well I'm amused that you call yourself sparkle, because that's exactly the "color" I'm going to suggest. Everyone will tell you that white is boring, and if your entire home is all white, perhaps so. But I do love a white bath with rich brown wood and natural texture.

There's so much movement in your tile, and so many tones of neutrals, that I think just adding metallic finishes and cozy white soft goods will complete the space while keeping it looking cohesive. If you use color, I'd go with a tone from the tile.

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pick a color from the wall tile - purple!