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Since you're quite sure that blondes have more fun, it's no surprise that you definitely want to keep the overall light shade. But if you're in the mood for something new, you might decide that you'd like another color underneath your blond layer. If that's the case, you've got a rainbow of colors from which you can choose. A few hues in particular look especially nice with blond hair, so you'll want to keep them at the top of your list.
Brown
Adding a brown shade under your blond hair is a subtle way of getting a change. The lighter the brown you choose, the more natural it looks. It's totally up to you whether you want the look of natural low-lights, or a bold solid color by using a darker brown shade. Brown is a neutral color, so it works with all shades of blond -- and since it's underneath your blond color, you really don't have to worry about how it looks against your skin tone.
Red
Red is a really bold, bright color against light blond hair. Even if you only have a bit of the color peeking through the bottom half of your hair, it's really noticeable, so you definitely want a shade that provides a lot of contrast to your shade of blond. Red is a fiery, fabulous color, but only when you keep it looking its best. It can fade really fast, especially if you're outside in the sun a lot -- ahem, and not wearing a hat over your colored coif -- or aren't using color-protective products.
Black
You can also go to the dark side with some black strands underneath your blond hair. Black really plays off the light blond color, as there's such a dramatic contrast between the two colors. It doesn't look as natural as brunette shades, but if you want to make a statement, or are going for the shock factor, black might be a good choice. Black doesn't create the look of low-lights, but does add a lot of dimension to your hair. For a total two-tone effect, dye the entire bottom half of your hair black, or you can try coloring just a few sections to have the hue peeking through here and there.
Pink
Pink is a soft, pretty, feminine color -- and it looks oh-so-fab in blond hair. Under a blond layer, it provides a much softer, subtler look than you get with other colors. You can color just the underlying ends to get a cool dip-dyed effect. But for an even softer look, go with a peachy-pink shade, which is sheerer and provides more glow.
Tips
If you're not sure which color to try, or you really want a unique, chic look, add in more than one color underneath your blond hair. A multicolored mix of pink and purple or black and brown creates a really interesting, bold look. And remember that the way you style your hair affects how much of the underneath color you show off, especially with longer hair. Style your hair down straight to hide any color underneath, or pull it over your shoulder or into an updo to show off all the spectacular tints in your tresses.

