Blue is part of the purple color family and another favorite of mine. Regardless of skin tone, you can mix/match a variety of blues to enhance your eyes, eye color, or overall look. MAC cosmetics has a blue eyeliner called Navy Stain and its absolutely lovely. It mixes a hint of silver with blue, to make your eyes pop... 
You can use the liner at the bottom of your eyes by itself or mix with a black eye pencil and liquid black liner at the top. You can even mix blue shadow with a cream base and keep your lips a pale pink to have the focus be just your eyes.
For the bold & daring, you can mix lavender shadow with a teal/blue base and line the bottom of your eye with a blue liner, being sure to keep your lips super simple with just some neutral gloss...
