I use this as a base shadow (over a primer) and LOVE it. It lasts all day and has a light pigment and just the right amount of shimmer. It was about 4 dollars for a large jar full. I ordered this about 6 months ago and have not even used half of it yet. (I wear it 5-7 days a week).
You can use coastal scents mica powders in other ways as well (nail polish, lip gloss, eyeliner, liquid/cream shadow, mix with bronzers, lotions, etc). I have not tried using it for anything else yet, but I love it as an eyeshadow.