Works Best On: Fair to neutral skin tones, due to the cooler undertones of their skin. While Godard says any eye color can rock this color, it complements blue-eyed gals the most.

Mermaid-like hues are some of our favorite colorful hair looks to ogle, but note that, they don't always flatter the tanner ladies. "These colors should be avoided by the olive complexion because they could enhance the natural green tones in the skin," Godard says. Though we will point out that Nicole Richie rocked it all the same, thank you very much.

Try: Manic Panic High Voltage Classic Cream Formula Hair Color, $13.99.

Oh, hey there, gorgeous. Her baby-blue eyes look striking against her three-shades darker hair color. Love her look? She dyed her blonde strands using Manic Panic High Voltage Classic Cream Formula Hair Color, $13.99, in Bad Boy Blue.

Image via @annakarinhell

This aqua ombre incorporates all the blue-green shades, creating an amazing contrast between her fair skin and dark eyes. Plus, it's just so pretty. (Insert love emoji here.)

Image via @sophiehannah

Katy Perry already slays, but her green eyes paired with her turquoise-green hair just looks sexy AF. The matching eyeliner and nude lip make her eyes the focal point.

Image via @teenvogue

Works Best On: This hue works best on neutral complexions and olive skin tones. It also flatters green, blue and hazel eyes.

According to Godard, superfair-skinned ladies should steer clear. "This color doesn't flatter very pale or rosy complexions," Godard says. Gray is a cooler-toned hue, which looks better on neutral skin tones.

Try: Wella Color Charm Liquid Permanent Hair Color, $6.19, in Cooling Violet. (Please note: You will also need a developer with this product.)