John Mann

This is used to change the header image, background color, and header link on the login page. 
Simple customization for the login page to make it more personalized.
<ol>
<li>Customize login header image</li>
<li>Customize link for that image.</li>
<li>Customize background color</li>
<li>Customize link colors and hover colors on login page.</li>
</ol>
Features: Uses new Color Picker, is localizable, uses media picker for images.

LotekMedia Custom Login

This is a plug-in to do some basic customization to the login page.

Frederic Serva

Birds Custom Login allows you to easily customize your admin login page according to your needs.
This plugin is compatible with all of WordPress’ built-in functionalities and logout links will still function as they should.
If no logo is uploaded, the default WordPress logo is shown.
Live preview your Login Page in the plugin settings page. No need to Log Out!
This plugin is Localization/Internationalization ready and follows WordPress i18n standards.
Bundled translations:
<ul>
<li>French</li>
<li>Portuguese (pt_PT) (Thanks to <a href="http://www.pedromendonca.pt/" rel="nofollow ugc">Pedro Mendonça</a>)</li>
<li>Swedish (Thanks to <a href="http://www.wpdailythemes.com/" rel="nofollow ugc">Peter Nilsson</a>)</li>
</ul>
Features:
<ul>
<li>Responsive design</li>
<li>Custom logo</li>
<li>Background color</li>
<li>Fullscreen background image (The image will stretch to fit the page, and will automatically resize as the window size changes.)</li>
<li>Rounded or Squared form (You can change the radius of the rounded border)</li>
<li>Form label color</li>
<li>Form background color</li>
<li>Form Style (Flat or Shadowed Box)</li>
<li>Button Colors (Background & Text)</li>
<li>Hide/Show “Register – Lost your password?” links</li>
<li>Hide/Show “Back to” link</li>
<li>Message boxes left border color</li>
<li>“Register – Lost your password?” & “Back to” links colors (+ hover)</li>
<li>Live preview within the settings screen</li>
</ul>
<blockquote>
Upgrade to the Premium Version to take advantage of new and more advanced features…
Although the free version is full-featured and can be used without any limits, the premium version provides more features:
<ul>
<li>Colors transparency</li>
<li>Links to external images</li>
<li>Fullscren background image or not. And controls over its position</li>
<li>Instant preview (for Custom CSS too)</li>
<li>Settings Import / Export</li>
<li>Support via dedicated forum</li>
</ul>
And don’t worry about your free version settings… 
You’ll be able to retrieve them with a migration tool included in the premium version.
Click on the following link to find outmore about the <a href="http://www.tenbirdsflying.com/theme/birds-custom-login-premium/" rel="nofollow ugc">Premium Version</a>
</blockquote>
Contribute
Want to propose a translation? <a href="http://www.tenbirdsflying.com/contact/" rel="nofollow ugc">Contact me</a> (please DO NOT use this form for support requests)
If you’d like to contribute to this plugin, you can find it <a href="https://github.com/fredserva/birds-custom-login" rel="nofollow ugc">hosted on GitHub</a>.
Donate link:
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=JDCQYELVWT6T6

Birds Custom Login

Birds Custom Login allows you to easily customize your admin login page according to your needs.

LotekMedia Custom Login vs Birds Custom Login