danielauener

This plugin lets you change the entire color scheme of the current theme via the 
theme customizer.
4 steps to your customized color scheme
<ol>
<li>The plugin extracts all the color settings from the css of your current 
theme. You trigger this process from the plugin settings page. All css files in 
your theme folder will be scanned.</li>
<li>After scanning the css, a template file gets created which will overwrite all 
the color settings of the current theme with your custom colors.</li>
<li>You create a custom color scheme by following the instructions on the plugin 
settings page.</li>
<li>You go to the theme customizer and choose your custom color scheme in the 
‘Color schemes’ section.</li>
</ol>
A more detailed description is available on my blog <a href="http://www.danielauener.com/color-scheme-every-theme/" rel="nofollow ugc">http://www.danielauener.com/color-scheme-every-theme/</a>. You are wellcome to give feedback/ask questions directly on my blog as well.
Read about the new features in version 2.0 here: <a href="http://www.danielauener.com/plugin-update-color-scheme-every-theme/" rel="nofollow ugc">http://www.danielauener.com/plugin-update-color-scheme-every-theme/</a>.
There is even a github-repository on: <a href="http://github.com/danielauener/color-scheme-every-theme/" rel="nofollow ugc">https://github.com/danielauener/color-scheme-every-theme/</a>

Color Scheme every Theme

This plugin lets you change the entire color scheme of the current theme via the

Goal Prevail

WordPress 7.0 changed the default admin color scheme to “Modern”, renaming the long-standing classic palette to “Fresh” and migrated existing users over to the new default. This plugin quietly restores the classic Fresh scheme for every user, exactly once, without taking away anyone’s freedom to switch back later.
<ul>
<li>Sets the color scheme to Fresh for newly registered users.</li>
<li>Migrates each existing user from “Modern” (or no preference) back to “Fresh” the next time they visit the dashboard, exactly once.</li>
<li>Leaves users who already chose another scheme (Light, Blue, Midnight, Ocean, Coffee, Ectoplasm, Sunrise, etc.) completely alone.</li>
<li>Restores the classic “Fresh” look on the login screen too, the blue WordPress logo, the classic blue submit button, and the classic blue input focus ring.</li>
<li>Cleans up after itself when deactivated, reverting every migrated user back to “Modern” and removing its own user metadata.</li>
<li>No settings page, no public front-end assets, no scheduled jobs, no mass updates on activation. The login styles are printed only while the plugin is active and disappear the moment it is deactivated or deleted.</li>
</ul>

Restore Old Admin Colors

Restore the classic pre-7.0 "Fresh" WordPress admin color scheme as the default, without overriding custom user choices.

Color Scheme every Theme vs Restore Old Admin Colors