So in my eyes and experiences, I think there's two ways to go about the trend. There's either dark roots or light tips. Now, I know, that may confuse a few, but here's what I mean.
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Don't really know if that makes sense, but I just see it as different placement of the fade. I personally think that this works best by using your natural color at your roots. I think there are people who actually place their color on their roots, but it kinda defeats the lazy element of this technique, by making it more maintenance---either way it's up to you. I think that people with naturally lighter hair, pull off the dark roots better, and those with naturally darker hair pull off the light tips better. This is all my opinion, though.
Of course, with trends, we always have trends gone wrong:
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There's different ways to achieve the look. If your hair is naturally on the lighter side, you can probably get away with playing with permanent and/or semi-permanent color. If you have darker hair like me, you probably have to go the bleach route. Bleach isn't as scary as it seems, to me. it's just a lot of conditioning, and your hair will be ok (kinda).
Do you like the ombre trend? Is it over already, or did you never like it in the first place. I think it's a great way to change up your look without the commitment of a full head of color :)