Change the Snow Leopard login screen with this video tutorial. Download and install the application Ravissant, an app that lets you customize the login screen in every aspect. Have a background image ready and an Apple logo image, if you want. Modified Apple logos can be found here , created by [http://evil-slayer.deviantart.com. Evil-Slayer]. Open Ravissant, and you should see your login screen, but don't try to log-in! IMPORTANT! If you want to keep your original login screen, go to the top...