ThemeZee

The Custom Color Palette plugin allows you to change the default color palette in the new WordPress Gutenberg Editor.
It replaces the color palette of WordPress Core and the theme.
<h4>Enable and change colors from three categories</h4>
<ul>
<li>Main Colors 
Primary, Secondary and Accent colors</li>
<li>Grayscale Colors 
White, Light Gray, Dark Gray, Black</li>
<li>Primary Colors 
Red, Green, Blue, Yellow, etc.</li>
</ul>
<h4>Requirements</h4>
This plugin only works with the new Editor. You have to use WordPress 5.0 or the <a href="https://wordpress.org/plugins/gutenberg/" rel="ugc">Gutenberg</a> plugin.
Note: Changing colors works with CSS variables and is not supported in outdated browsers like Internet Explorer.

Custom Color Palette for Gutenberg

A small and simple plugin to adjust the default color palette of the new WordPress Gutenberg Editor.

Jonathan Daggerhart

Toucan – Gutenberg Color Palette is a simple plugin that gives administrators the ability to choose which colors are available in the Gutenberg editor. A predefined list of colors will make it easier for all the site’s content creators to adhere to the same styles and guidelines.
This plugin also allows administrators to disable the “custom color” option in the Gutenberg color picker.
Photo by <a href="https://unsplash.com/@zmachacek?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText" rel="nofollow ugc">Zdeněk Macháček</a> on <a href="https://unsplash.com/s/photos/toucan?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText" rel="nofollow ugc">Unsplash</a>

Toucan – Gutenberg Color Palette

Toucan - Gutenberg Color Palette is a simple plugin that gives administrators the ability to choose which colors are available in the Gutenberg editor …

Custom Color Palette for Gutenberg vs Toucan – Gutenberg Color Palette