For example, brown and caramel are popular, creating a trend that seems to go from dark brown to very light brown. Jessica Alba sports this look with a dark brown at the top. Anna Kendrick is doing it as well, in a slightly darker way. Mischa Barton is also a fan of this look, as is Kate Beckinsale.
If you are looking for something more dramatic, take the dark brown to a near-black and the light color to a golden color that is nearly blonde. This will give your hair a bright, very dramatic look that will frame your face and make your eyes pop. Lea Michele sports this look quite well, as does Drew Barrymore.
If you want something super chick, a great ombre look is to go from a dark golden color to a light sunny blonde. This will give you a sun-bleached look that is great either straight or curly.
Even redheads can get in on the trend. A red-to-blonde ombre is a very popular and very sweet look. It gives redheads a little blast of color for a great chic, girly style. Nicola Roberts has recently become a fan of this look. Some are even taking their hair from a dark amber to a light red color.
What if you are looking for something much more dramatic? This comes in a pairing of any color with a bright non-natural color. Blonde or brown with pink is a very popular combination, but other celebrities are taking it a little further. Jamie King has taken hers from a light brown to a platinum and then a deep blue for a unique look.
Source: http://www.herinterest.com/ombre-hair-trend-for-celebrities/