When you want subtle definition, and to look pulled together but not overdone, you can't really go wrong with these shades. L-R Omega (Great for filling in brows if you are fair skinned) Espresso, Era and Charcoal Brown. For ease I purchased the pro-palette version of these shadows and put them together to form my own neutral palette.
L-R: Omega, Espresso, Era and Charcoal Brown.
Eyeshadow refills for the pro palette case are priced at £10 each and are avilable from MAC