Blues, I'm very fair with red undertones, anything blue makes me look like I'm severely hypothermic [aka grey and lifeless].
Greens look like mold on me. I haven't even bothered trying yellows and other crazy colors, though oddly enough reds are not that terrible on me.
I actually think the only colors that look good on me are browns [or the brown family / golds / bronze etc], and some purples like Pearl of the earth, I'm not a very colorful person.