allilevine

This plugin adds an options page (Settings > Login Screen) that allows you to customize the WordPress Login Screen (wp-login.php). You can:
<ul>
<li>Upload a custom logo (it will be resized to fit if necessary)</li>
<li>Choose a link color</li>
<li>Choose a link rollover color (defaults to a darker shade of the link color)</li>
<li>Choose a button color (defaults to a button version of the link color)</li>
</ul>
The plugin also links the new logo to your site URL.

Simple Login Screen Customizer

Good

Choose a logo and link color for the login screen.  The plugin will do the rest.

Harish Chouhan

Themeist Co

Custom Login Logo lets you replace the default WordPress login logo with your own — no need to touch code or upload files via FTP.
Just activate the plugin and use the built-in media uploader on the settings page to upload your custom login logo. It’s quick, simple, and works with most themes.
This plugin is perfect for branding client sites, personalising the login screen, or maintaining a consistent visual identity.
Features: 
– Upload your custom logo using the built-in WordPress media uploader 
– No need for FTP or coding 
– Works with most themes and setups 
– Retina/high-DPI image compatible 
– Lightweight and fast
If you find this plugin useful, please consider leaving a 5-star review on WordPress.org.

Custom Login Logo – Easily Add a Logo to Your WordPress Login Page

Easily add a custom logo to your WordPress login page using the built-in media uploader.

Simple Login Screen Customizer vs Custom Login Logo – Easily Add a Logo to Your WordPress Login Page