an updo I like is where i twist the front sections of my hair back (usually about 2-3 sections) and clip them (high or lower, kinda between the top, and back of your head) with jaw clips. then you pretty randomly clip up the rest of your hair into a sort of big curly bun. I do this when my hair is wet.
A plus is, it gets quite a few compliments, people are always saying 'it looks so elaborate.' but it is super easy.
My hair is shorter then shoulder length, and i have layers, so i'm sure it would work for you.
if you want a photo, ask, cause i have my hair up in the style right now, lol.
oh, and you can easily dress it up or down, clips headbands etc. HTH