Under your rules, sdesaye, I can't think of anything - you're much too strict. Although come to think of it, I have the silver NPs, too, and even I can't think of a reason to get these as well, and I'm all about rationalizing. I would maybe say you could wear them when it's too cold for a peep-toe.
Also, for some reason I think they also had multi glitters when we were in the store (sorry in advance if I'm making that up and I get someone's hopes up). I don't remember seeing gold.