You used to be able to get a futon cover in "Whitaker green," but apparently no more. (I feel the wind of the wings of legal eagles.)
As for nailing the color for your palette, I'd just go about it as with any other, starting with your best guess and then incrementally adjusting for value, hue, and intensity. The problem with the "formula" approach is that even a soft, nondescript background is going to require subtle adjustments to any formula, as would, say, a person's appearance in light require adjustments to any "flesh tint" formula.
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