delwinv

A very tiny plugin that adds the ACF field key, field name, Flexible Content field name and Flexible Content layout name to the WYSIWYG 
editor body tag, allowing you to target these classes, along with the existing post-type-* classes added by default by WordPress, in 
your editor-style.css for a better admin/editor experience.
This works for both ACF and ACF Pro, version 5.
<h3>Usage</h3>
<ol>
<li>Install the plugin through the Install Plugins interface or by uploading the <code>acf-plugin-wysiwyg-styling</code> folder to your <code>/wp-content/plugins/</code> directory.</li>
<li>Activate the ACF WYSIWYG Styling plugin from the Admin > Plugins menu.</li>
<li>Create or edit your editor-style.css in your theme directory and use the newly added classes to style your WYSIWYG editors.</li>
</ol>
For example:
<ul>
<li>
The ACF WYSIWYG field with key field_9999ffff11112222 can be targeted with the following CSS:
body.acf-field-key-field_9999ffff11112222 { 
 background-color: red; 
}
</li>
<li>
The ACF WYSIWYG field with key field_9999ffff11112222 in the “room” post type can be targeted with the following CSS:
body.post-type-room.acf-field-key-field_9999ffff11112222 { 
 background-color: blue; 
}
</li>
<li>
All ACF WYSIWYG fields named “my_wysiwyg” can be targetted with the following CSS:
body.acf-field-name-my_wysiwyg { 
 background-color: yellow; 
}
</li>
<li>
All ACF WYSIWYG fields in the Flexible Content field named “page_content” can be targetted with the following CSS:
body.acf-flex-name-page_content { 
 color: green; 
}
</li>
<li>
All ACF WYSIWYG fields in the Flexible Content layout field named “test_layout” can be targetted with the following CSS:
body.acf-layout-test_layout { 
 font-family: “Computer Modern Serif”; 
}
</li>
<li>
The ACF WYSIWYG field named “my_wysiwyg” in the Flexible Content layout field named “test_layout” can be targetted with the following CSS:
body.acf-layout-test_layout.acf-field-name-my_wysiwyg { 
 border: 4px solid red; 
 height: 100%; 
 margin: 0 auto; 
 max-width: 100px; 
}
</li>
</ul>
N.B. I target using the body tag so that a user cannot accidentally target the admin CSS in their edit of the field (regardless of how unlikely 
that would be).

ACF WYSIWYG Styling

Provides the necessary CSS classes in ACF WYSYWIG editor to allow for complete styling of the admin interface.

sarap422

Category Color Picker lets you assign a color to each WordPress category and automatically applies that color to post listings and category links on the front end.
<h4>Main features</h4>
<ul>
<li>Adds a color picker to the category edit screen</li>
<li>Automatically reflects the chosen color on the front end</li>
<li>Automatic text color adjustment based on relative luminance</li>
<li>Customizable CSS selectors</li>
<li>Adds “Color”, “ID” and “Noindex” columns to the category list</li>
<li>Sortable by the ID column</li>
<li>Per-category noindex setting (applies to the category archive, single posts in that category, and tag/date archives that contain those posts)</li>
<li>JSON export / import of categories (including color and noindex settings)</li>
</ul>
<h4>Compatible plugins and themes</h4>
<ul>
<li>VK All in One Expansion Unit</li>
<li>Content Views</li>
<li>General WordPress themes</li>
<li>Any element via custom selectors</li>
</ul>
<h4>Usage</h4>
<ol>
<li>Activate the plugin</li>
<li>Go to Posts > Categories and edit a category</li>
<li>Pick a color with the color picker</li>
<li>Optionally enable the “Noindex” checkbox</li>
<li>Optionally customize selectors under Settings > Category Color</li>
</ol>

Category Color Picker

Add a color picker to WordPress categories and reflect category colors in post listings and links. Includes per-category noindex settings.

ACF WYSIWYG Styling vs Category Color Picker