MAC Suite Array eyeshadow in Smoke and Ash. (Retail Price: Php880, so you get two shadows for a little over the price of one eyeshadow pan). Both shades are
"matte with an overlay of pearl and provide sheer to medium buildable coverage with a beautiful luminescent effect."
The coverage is quite sheer, since I used only 1-2 swipes for the black one (smoke) but if you add more layers, you can go for a more opaque coverage like the silver one (ash). My main color usually is the silver one and I use the black to contour but you can make black the main color and add silver as a highlight.
To apply, MAC makeup artists recommend using a cream eyeshadow base or primer and then really layering for intensity as these are quite sheer. If you want a subtle wash, then 1-2 swipes would do. But for super-duper intense colors, you might need layering and a bit of patience.
Recommended tools: a dense eyeshadow brush, a sponge tip applicator, or your finger. :)