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If you want a living room to feel coastal without going themed, I would start with the quiet base first: warm white or cream upholstery, one natural woven texture, one wood tone, and only one muted blue moment. The part people usually skip is breathing room. If every surface has decor on it, even nice pieces start to feel busy.

My quick test: remove one color family, turn on the lamps, and leave only one styled group per surface. Then add texture back in with a basket, shade, tray, or pillow instead of buying more small objects.