These cost a small fortune, considering what they are ($5 for 3) but wow, perfect for me! With my long hair having a tendency to get in my way I always keep a spare elastic around my wrist. Now it's not tacky! (they also come in gold tone).
This is the easiest hairstyle ever, idea courtesy of pinterest! Dutch braid (i.e. inside out French braid) from the side and finish in a bun. I couldn't manage to hide the elastic though! (didn't figure that out til the car ride home).