I stan Yogurt, which is a subtly shimmery light pink, but Milk is a popular choice, since the white really makes your inner corners POP.
Promising review: "I am lazy and hate doing my makeup, especially after a morning workout on a weekday. I wanted something I could throw in my bag and smear around my eyes in a couple of seconds, and to just add a little color without the fussiness. This fits the bill perfectly. It gives my eyes a little definition, but isn't super noticeable. The slight shimmer also makes me look awake on days where I'm dragging. It is not intensely shiny, though, which is important to me — I'm not a disco ball! It just reflects light and looks luminescent, not glittery. Because this is so easy to use, non-irritating, and is the exact color I was looking for, I expect that I will keep ordering it as long as it's available." —Rachel
Get it from Amazon for $2.52+ (available in 25 shades).
For a ~higher-end~ option, Laura Mercier Caviar Eye Sticks are also super easy to use and have great payoff.