change appearance of log in screen

How can I change the appearance of the screen that pops up when I go to log in? I am tired of the flash videos of dancing with the stars, the weather notice, etc. I'm even tired of the blue borders. I'd rather have something like the Bing home page with a different photo each day, but I would settle for the same photo that I can change when I want to. The chat room said I can't can't change it. I hope they are wrong.