On a slightly serious side, isn't this a personal preference based on wall
color/ decor? I have all three colors in my house and there is no code
violation for mixing colors. I believe codes (if there really is such a
thing) cover specialized use such as hospitals.

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What color outlets work best in a bedroom, white, ivory, or brown?
Also, must the outlet cover plates match the outlet or is a mismatch a
code violation?