Blue black hair color ideas are an unnatural shade of hair color. Though, it is a super funky and cool looking hair color. Many people who like punk hairstyles go for some unnatural shades of hair colors like green, pink, and purple. However, you can select a nice shade of purple/violet (same thing), and accompany it with a nice layered hairstyle and look stylish. But, purple is a color which suits only people with cool skin tones and cool eye colors. People with warm skin tones and warm eye color should 'totally' avoid this color or it can make their face look sickly or tired. Want to know if you fit the cool category? Here are the skin tones, eye colors and natural base hair color of people who fit in the cool category.