The walls had a lovely reddish-brown color. Yes.
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MustAskWould 'have' ever work here?The walls had a lovely reddish-brown color.Yes.
MustAskWhat color is the car?What color does the car have?The second is not natural English. The normal verb for colour in English is BE - 'The car is brown'. Occasionally, as with your original question, HAVE is possible, but you are always safer with BE.