Idk,I think Zoso looked kind of slimy goldish under his hood right before he died.And in his original tale Rumplestiltskin is an imp(implying green)who can spin straw into gold.
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Keeper of King George's Coat of arms;Tiny's pickaxe;Belle's bronze vase;Emma Hacker device and true love kiss to Henry;Granny's surcharge on pickles;Snow's "Good will always win;Regina's apple turnover;Gold's pink shirt,Mickey phone,&glasses(1x12);RQ's chess set,and Chip's shattered remains