I've never seen something like this in pure CSS. If anyone knows of anything this impressive, please post a link to it.
http://sy0t0s.bplaced.net/demo/hero/ - Apple logo
http://sy0t0s.bplaced.net/demo/tubes/ - Nixie tubes
http://sy0t0s.bplaced.net/demo/opera/ - Opera Browser in your browser
I have more, but don't want to spam links. If you want to see more you can crawl through the /demo/ folder on the page. Most of them are experiments with CSS3, javascript and html5.
I've never seen something like this in pure CSS. If anyone knows of anything this impressive, please post a link to it.