Shimmer is my middle name, or at least it should be ;)
This product is something I didn't know I needed until I got it, and now I find myself reaching for it every time I do my eyeshadow.
This is me quickly slapping it on without a primer so you can see what it would look like on the lids. I normally wouldn't put it all over the lids.
What Sephora says:
Overshadow was created to add a luxe look to the lid, taking the most subtle daytime shadow and amping it up for nighttime fun. Apply over your favorite shadow to give a fresh look to your staple shadows colors. Dust the lighter shades on shoulders, cheeks—anywhere—for a sexy shimmer.
I love, love, love using this in the inner corners of my eyes. It really adds a nice highlight that really opens up your eyes. The powder is very fine and and be pressed on top of other shadows to give them a bit of shimmer. I don't know how I lived without this stuff before!
$15 originally but of course you can find it at Marshalls for less.