There are many WordPress plugins that will help you customize the default login page and even some that will help you create a login page within your site. My Simple Login will allow you to customize the default WordPress login in the following manner:
- Change the background color
- Add a background image
- Change the default WordPress logo, logo link and logo text
- Add a shadow behind the login box
- Change the login box background
- Hide the “Lost Password” link
It will help you do all this through a rather simple settings page under Settings > My Simple Login and simply work.