Bobbi Brown City Twilight.
See why it caught my eye? It's a shimmery, borderline foily multichrome shimmer. I think I'd even classify the finish as glass fleck, just a very densely packed glass fleck. The base color is a warm, taupe-tinged silver, but the strongest duochrome flash is a pink champagne color. Changing the angle reveals green, pink and orange. It's an oyster/mother-of-pearl color with lots of glittering shimmer crystals.
The formula on it was average. Not amazing, not bad. Workable, but it tended to clump a little if I was too hasty with my coats. Average dry time. Dried glossy.
The rest of the set consisted of an eyeshadow palette (eh... too muddy, too sheer), an eye cream (extremely rich!), a mascara (did absolutely nothing for me) and an eyeliner (AWESOME), but the best part really was the polish. I need to dig this out of my stash and wear it again because I've been craving light, sparkly, iridescent 'bubble' colors like this lately. And yes... that means this picture is nearly a year old. Heh.
I'm pretty sure this color is long gone. I want to say it was a Nordstrom exclusive and only available in the set, but it's probably shown up at a CCO somewhere with the rest of last fall's items.