AJ Troxell

With the Custom Login Page, you can change the background image of your login page, the background image/colo of your login form div, the main logo image of your login page, and add custom CSS. 
All through a simple interface. Remember to view the Help tab at the top of the settings page for the plugin.

Custom Login Page

Wordpress Custom Login Page allows you to change the background image, logo, form div attributes, and custom css of you Wordpress login page.

karevn

Themed login makes it possible to change the look of default WordPress login system using 
templates located at your theme folder, not just CSS-level customizations:
<ul>
<li>Login – login.php</li>
<li>Lost password form – retrievepassword.php</li>
<li>Registration – register.php</li>
<li>Registration confirmation – registered.php</li>
</ul>
If your theme does not contain one of the files described above – that is not a big deal, 
WordPress’s defaults will be used. See usage examples in “examples” plugin directory.
<h4>Plugin’s Official Site</h4>
<a href="http://karevn.com" rel="nofollow ugc">karevn.com</a>

Themed login

Makes WordPress login, registration and password retrieval pages totally themeable using WP theme mechanism.

Custom Login Page vs Themed login