Barrettes can be tough to pull off with short hair -- you have to find small ones that won't slip out, but you don't want to look like you've been raiding the kiddies' department. It's a fine line, but if you remember to stay away from brightly colored plastic (and anything princess-themed, of course), you're on the right track. For classic and understated, stick with basic lines and subtle hues -- tortoiseshell is always a good choice. For a night out or just to satisfy a do-it-up mood, check out those small, statement barrettes with gems or feathers or sequins and pick just one. Place it at the side, just above and behind your ear, for a chic effect.
Remember, too, it's key to find barrettes that have a little grip or traction to keep your shorter locks in place. It's so sad when hair flair falls out.