This is a do I tried when I was low on time and I didn't have time for my hair to dry. Quick, simple, and cute!
First braid your hair into a Dutch Braid. Which is a french braid accept instead of pulling the middle strand under the others when braiding you pull it over. (If you don't know how to french braid this lady has a lot of really good tutorials on her site that REALLY helped me to learn how.) http://www.cutegirlshairstyles.com/
Now, don't braid all the way down! Just til you run out of hair to pull into it... at the base of your hair line. Secure with rubber band. Then take the extra hair and make a messy bun!
That's it! :)