If you are getting a bit stale with your CSS, here are three articles to spice up your CSS-drive once again:
http://jonrohan.me/guide/css/creating-triangles-in-css/
http://nicolasgallagher.com/css-drop-shadows-without-images/
http://csswizardry.com/2011/02/css-powered-ribbons-the-clean-way/