This beach wave tutorial leaves perfectly undone summer waves with just enough volume. This technique also creates volume in limp, straight hair. You can also use this method to smooth unruly natural waves. I tried this and it works great!
The Beauty Department -- Double Rope Braid Bun. Pull hair into 2 ponytails side by side, section each into two and rope braid. Twist right rope braid counter-clockwise and in, then do the same with the left rope braid. Finish with hairspray.