I absolutely love ombre highlights like those seen here on Kate Beckinsale and I really really hope it remains a trend for a while because it is just SO easy to wear! No roots, no need for touch ups. I had mine professionally done, but I have several friends that bravely allowed me to experiment on them :)
I watched several videos on YouTube, professional and DIY. I found the technique seen in the following video, particularly interesting.
This technique seems kind of weird, and slightly risky, but it works!