I used IMPROPER COPPER as an eyeshadow base after my beautiful MAC buddy, suggested it. But it is true, if you are workin with bright colors like yellows and aquas, a white base like LUNA really makes it the e/s pop. Im not a fan of bases that have shimmer. I like the base to be white and flat.
For a while, I used BRONZER CCB under my bronzer as like a base and it worked pretty nice.