Note, all of these are actually plugins for your site. So you’ll need to install them like you do any WordPress plugin. The first one is called the Blue Admin and it’s a simple minimalistic admin theme for WordPress. The primary color is blue.
The next one is the Tamed Admin Theme. This simplifies the admin user interface and gives a calmer approach for the UI colors.
#3 is the Slate Admin Theme which uses dark brown admin bar with blue color for links, buttons and menus.
#4 is the Fancy Admin UI. It gives a blue top admin area and a soft gray menu bar. You can also change these colors under the general settings area.
#5 is Reimagined Admin and it’s a bold and dark WordPress theme.
#6 Admin Color Schemer is more of a way to change the color aspect of your admin area to anything you want.
#7 is the White Label Cms, and that allows you to customize and brand your WordPress admin area.
You can remove WordPress logos and change the admin area to meet your needs. This one is great for creating client sites.