It is not the mere fact that you can create triangles with CSS, but there are is a great technique that can be used for other CSS effects. As noted in the article, triangles can but used to create a unique chat bouble without images. Facebook uses them and you can too with just a bit of tweaking. Great resource for thinking outside the “image” box!
http://jonrohan.me/guide/css/creating-triangles-in-css/
