If your goal is a totally unnatural hair color such as blue, green, or pink, Punky Colour offers a great selection of shades. Whether you want a rainbow of colors on your head, or just a few highlights of hot pink, bright blue, or even bright yellow, Punky Colour is there for you. A caveat, however: all bright-and-crazy hair dyes are semi-permanent at best, but if you want the longest lasting unnatural hair color, you'll need to visit a salon. Professionals have access to longer-lasting, deeper-penetrating products.
Still, for at-home use, Punky Colour does a great job, and lasts for a couple of weeks, depending on how often you wash your hair. It also must be noted that if your hair is dark, you'll need to bleach away the color before applying Punky Colour, otherwise it won't show up. This is true of all of the "unnatural" hair colors.
Fashionista really likes Punky Colour, praising its relatively good staying power. They do comment that the containers are small, however, so if your hair is much past your shoulders, and you plan on coloring all of your hair, you'll need at least two jars.
There are 12 colors to choose from, including cotton candy, purple, green, and yellow.
Pros: Fun, bright colors and no harsh odor or chemicals
Cons: Color washes away fairly quickly, which may actually be a plus if you only want to play with unnatural color for a special occasion or short time. You'll need to buy an application brush and gloves separately
Buy Punky Colour at Ulta for $7.99