Blue extensions under blonde to create an asymmetrical cut. If you look under her chin to her left, you can see she just has an ordinary blonde layered bob, and the blue can probably be taken out and put in at will.
Blue streaks in my hair! I would totally dye it ALLLLLL blue if my work would let me. I like this gal's hairstyle but I am thinking a different shade of blue. My hair is brown so I am not sure how it would look. Love the color combo though!