Death Colors
This page uses slants to make the triangle, and a single 211 bytes image file for the "raster bars". The image is a PNG-file with full alpha transparency, so IE can't show it correctly. Using both a solid background color and a semi-transparent background image on top of it gives the appearence of a fading bar. In Opera, you can turn images off to see just the colors move. You can use Opera's full screen projection mode to change the appearence of the page.
via infimum.dk