We wanted something simple and quick today...........This is about as simple and quick as we get around here.
Pull all the hair back into a traditional braid. (Leaving some ends out to "flip" later.)
Poke a hole with your finger through the top of the braid. Then, fold the braid up and through the hole you made. (Behind the braid, not in front.) In this picture, I have pulled the braid up and through. (I'm lifting the ends up, so you can see where the elastic should be.) At this point, I stuck 2 bobby pins through the elastic and pinned it to the back of her head, so that it wouldn't slip out.
Now, you can fix the ends with a flattening iron and spray with hairspray.