Login image background

Hi,

I found awesome the code and css of the login design but image background description is missing and I need help with it. The image background would be in the login screen. Also outside of the login screen with background colour, image on top and size doesnt matter. Here is link to own login design: http://wpengineer.com/483/create-your-own-wordpress-login-design/

It helps if you show me CSS.