Vast HTML

This is a full featured plugin to help you edit your login just the way you want it. Lets you use or block the original wordpress 
css (the first plugin to do this). Comes with one pre made style you can use or deactivate. 
Very easy to create your own style using the style tags givin in the plugin. 
Please visit http://vasthtml.com/js/login-xchange-plugin/ for usage instructions.

Login XChange

This plugin will let you change the css of your login and register pages.

Jeff

Easily and quickly add a logo and customize the login, logout, and register pages. Simple settings so a user can make adjustments quickly and easily without knowing any code. You can add a background image, set it to repeat or just leave it centered, choose the color of text, link hover, and whether to display the “forgot password” and “register” links.
Adding a custom logo gives your clients a fully customized experience, rounding out your work for a real professional look. Custom css for advanced users provides you with complete control over the display when creating your custom login, logout, and register pages.
Users can:
<ul>
<li>Upload/Add a logo</li>
<li>Set logo height</li>
<li>Set logo width</li>
<li>Set the space between the logo and the top of the form</li>
<li>View a preview of the selected logo</li>
<li>Set the link that the logo links to</li>
<li>Add a logo image title</li>
<li>Set the pages background color</li>
<li>Set the form’s background color</li>
<li>Set the small form’s (inner form) background color</li>
<li>Set a background image for the whole page. Set it to repeat or not</li>
<li>Preview the background image</li>
<li>Set text color</li>
<li>Set the links color</li>
<li>Set link hover color</li>
<li>Hide the links</li>
<li>Hide the back to blog link</li>
<li>Submit button background color</li>
<li>Submit button’s border color</li>
<li>Set your custom css for complete control</li>
</ul>
Language Translations
<ul>
<li>Nederlands</li>
<li>French </li>
</ul>
Works with WordPress v3.3 up to v4.8.1
Works on all hosting providers
No Dependencies
<ul>
<li>This plugin does not require any php extensions and can work with PHP v5.3.</li>
</ul>
Contact
<ul>
<li><a href="https://layer7web.com/contact/" rel="nofollow ugc">Layer 7 Web – Plugins</a></li>
</ul>

L7 Login Customizer

Customize your login, logout, and register pages. Add a custom logo and background image easily.

Login XChange vs L7 Login Customizer