This girl has a great blog with lots of different hair styles and videos on how to do them.
A quick updo for short hair. Grab a handful of bobby pins and take little sections of hair and twist them back leaving the ends sticking out so you get a messy chignon effect. Spritz your bangs with a little volumizer at the roots and blow-dry them so they lay sideswept across your forehead. Finish with a light, fine mist of hairspray to keep everything in place.