Fashion may have the little black dress, but beauty has the little black eyeliner — and it's served us well. But if the spring runways are any indication (and they usually are), another shade is soon to be worthy of our devotion. Blue shadows and liners were trending in a major way. And we mean blue like you've never seen it before; pearly pastels, gutsy cobalts, and electric brights. And now that spring is just around the corner, it's the ideal time to start experimenting.