There hair is dyed and they just let it roots grow out. My hair is the same way Black then brown then light brown. I like it I've noticed the trend also. I think it gives the person a more softer natural look. Now the light pink is nice, i don't know about the blue.
I remember doing this 3 years ago (my hair is naturally black, & I dip dyed the tips brown). Everyone thought I was crazy & weird lol, but now they're all doing it- guess I was a trend setter after all, lmao? xD
Pretty! I only like the natural - colored ombre's though. The good thing about ombre is that (unlike when you normally dye your hair) if you do just the tips, you can try to grow it out . . . and then simply cut off the bottom and you'll have your natural color back. Even though this will take quite a while, it's better than dying your full hair. I think it looks fab!