For example, colors like green and purple can make brown irises look brighter and bring out hidden flecks of gold and green. The best part? Wearing green on your eyes can be as easy, or complicated, as you like. Opt for a wash of olive on the lids if you're feeling minimal, or grab a few shades and craft a fresh smoky eye for a more complex take on the hue. The color may seem simple, but the options are endless — and they all flatter.