I've never used it for korkers, but what about that Offray Galena ribbon? It's not exactly glitter ribbon, but it's the stuff Michelle uses for her bumblebee wings: http://hipgirlclips.com/forums/free-....html#post5541
I'm not sure how it would kork, but it's worth a shot, since the glittery stuff is woven in, not on top. I've seen it at Michael's and Joann in a bunch of colors. Good luck!