The same principles apply to makeup as to clothing and hair color, if the color is already in your complexion/eye/hair it will look natural on you. Find your 'seasonal color', and your makeup will look great..
I use powder eye shadow in rose pinks, lavenders, and soft cocoa/raspberry, blended from light to dark from the inside of me eyes outward..
A $4 3-color compact from Cover Girl will last me about 3 months, less in summer when I wear it almost everyday, longer in winter when I only wear it when I dress up and go out. In summer I am outside amongst the boys at the beach and stuff, so yeah, I try to keep up appearances more, lol..