Apsara Aruna

Simply customize your admin login page using this plugin.
A few notes about the sections above:
<ul>
<li>Customize admin login logo</li>
<li>Change login with username only.</li>
<li>Hide lost password reset link</li>
<li>Hide back to site link</li>
<li>Change/Custom error message</li>
<li>Dynamic image loading with your choice</li>
</ul>
Also see my other plugins 
* <a href="https://wordpress.org/plugins/widget-youtube-subscribtion/" title="Easy Subscribe Button Widget" rel="ugc">Easy Subscribe Button Widget</a> 
* <a href="https://wordpress.org/plugins/embed-page-facebook/" title="Easy Embed Page Widget" rel="ugc">Easy Embed Page Widget</a>

Simple Login Customize

Simply customize your admin login page using this plugin.

ryansommers

Slate provides a clean, simplified design for your WordPress Admin area.
Our goal was to simplify the visual design with a primary focus on the content writing experience.
If you like Slate, please consider leaving a review here on WordPress. Thank you!

Slate Admin Theme

This admin theme is particularly well thought for High resolution screens so it’s better than default theme.

Good

A clean, simplified WordPress Admin theme.

Simple Login Customize vs Slate Admin Theme