The backgrounds driving me nuts because of exactly that. problem I think is every other one of the colors makes some other piece go 'hollow' or washes it out. The effect is kinda cool in a couple cases, but I could see some people disliking the effect, too.
Not sure, I've got r/masseffect at reddit looking too, if they concur on the gold/yellow, i've been leaning towards that too.
thanks for the input! might just be the best choice.