Make your choice according to your shade of brown hair. If you have extremely dark brunette hair, you probably don’t want blonde highlights. This looks rather extreme and takes away from the beauty of your natural hair color. Instead, try a shade of brown that's only one or two shades lighter than your natural hair color. Choosing the type of brown highlights also depends on whether your hair is cool-toned or warm-toned. Examples of cool-toned hair are ash and beige browns. Warm-toned hair has golden or reddish undertones. Your highlights should reflect the cool or warm tones of your hair.
If your hair is in the mid to light brown region, experiment with blonde highlights. A gorgeous honey blonde looks great with a light chestnut color. Again, for subtle highlights, don’t go too many shades over your natural hair color. The idea is to give your hair a sun-kissed look instead of an all-over blonde look.