I'm always on the hunt for a great purple eyeliner. A makeup artist recommended a Defining & Brightening Eye Pencil Duo ($28) by Lancôme because it's not too dark and not too bright or shimmery. It's a subtle deep eggplant that completely passes for a neutral. It looks amazing on green eyes, but my best friend who has brown eyes is now also an obsessed and loyal fan.
The twist is that the other end of the pencil contains the lightest shade of iridescent lilac that has an illuminating effect. The color isn't dramatic, but it creates a halo effect when you apply it just above your brow, to the inner rim of your eyes and just under the purple eyeliner. It goes on smooth without having to be warmed up, and it has a creamy, high-quality texture.
The only drawback is that you might still be wearing it the next morning when you wake up. Even when you wash and Q-tip, somehow a few stubborn remnants seem to stick around in your lash line.