The only drawback is that it may leave the roots lighter (bleached) than the rest of the hair. That might make things much more interesting, but we'll see.
They all look at me a little funny for requesting 'blue highlights', but I doubt it will turn out bad. Maybe odd or just 'different', but that's okay.
I won't be taking pictures during the process this time, but I'll get finished shots once I get back home.