The Tailored Login plugin will allow you to easily style your WordPress login page using a custom style manager and two additional widget areas.
Added Widget Areas
This plugin also adds optional top and bottom widget area to your WordPress login page.To use those optional widget areas navigate to the Widgets area under Appearance in the WordPress Admin area. Then you will see two new widget areas have been added to your list of available widget areas.
By default those widgets are not displayed on the WordPress Login page unless you add content to them. If you ever decide that you no longer would like to display those widgets on your login page all you have to do is remove in widget content that you have placed in those areas.