I've been wearing my hair up in a bun a lot recently. It started out as practical, to keep all my hair up and out of my face, but then I decided it was a good look.
It reminds me of Lykke Li. She almost always has her hair in a high bun.
I've noticed girls on fashion sites and celebrities workin' that up-do lately, as well.
Another style trend taken from ballerinas. We already took leg warmers, leggings, tutus and leotards. Just don't try to work all those trends at once.