Ashok

Adminpress is a very simple plugin that will help to customize the WordPress admin panel. You will have lots of options and those are very easy to use. The plugin is very user friendly.
Features 
1. Common Styles 
2. Menu Styles 
3. Login page styles 
4. Menu Management 
5. Dashboard Widget 
6. Custom Admin Bar 
7. Footer Text 
8. Replace text 
9. Ajax Search 
10. Custom css and js

Adminpress – WordPress Admin Theme

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.

Adminpress – WordPress Admin Theme vs Slate Admin Theme