brightonmike

Coffee Admin Theme gives the dashboard a bolder look with sumptous dark tones and a textured background. The theme is fully compatible with the latest version of WordPress supporting the new fly-out menus. Because of this, the theme will not work as intended in older versions.
The plugin has options to switch between different themes, and I will be adding more themes over time.
You also get a great selection of Google Web Fonts to choose, further enhancing your dashboard experience.

Coffee Admin Theme

Coffee Admin Theme is a WordPress dashboard plugin which adjusts the look and feel of the dashboard, via custom themes and fonts.

Cico Zeljko

wpvote

This is a simple plugin that will make your wp admin panel theme much more pleasant for work. Using specific colours you improve your work surrounding and simple and clean design of your wp admin panel.
<ul>
<li>30 color themes.</li>
<li>Tested with other popular plugins.</li>
<li>last update 8/5/2019</li>
</ul>
Video: 
https://www.youtube.com/watch?v=usB0PPeEczw

Colorize Admin

This is a simple plugin that will make your wp admin panel theme much more pleasant for work.

Coffee Admin Theme vs Colorize Admin