This plugin allows you to add and image as background of posts, pages or custom post type in general (in the same way as a thumbnail).
<ul>
<li>This is a rewrite of my old plugin <a href="https://wordpress.org/plugins/post-background/" rel="ugc">Post Background</a> which I do not have access anymore. *</li>
</ul>

WP Post Background

This plugin allows you to add and image as background of posts, pages or custom post type in general (in the same way as a thumbnail).

lubus

Ajit Bohra

<blockquote>
Disclaimer: Experimental feature plugin to extend gutenberg block. Have a suggestion feel free to send a PR or <a href="https://github.com/lubusIN/block-background/issues" rel="nofollow ugc">open an issue</a>.
</blockquote>
Extend gutenberg blocks with additional background options
Usage
<ul>
<li>Simply activate and new options for background will be added to inspector / sidebar options</li>
<li>Insert block of your choice add set background options</li>
<li>Live preview of background changes in your editor</li>
</ul>
Roadmap
<ul>
<li>More customization options</li>
</ul>
If you have any suggestions/Feature request that you would like to see in the upcoming releases , feel free to let us know in the <a href="https://github.com/lubusIN/block-background/issues" rel="nofollow ugc">issues section</a>

Block Background

works fine. i'd update the docs page, on how to implement own color palettes, as this was something i had to figure out myself. here is a manual.

works as expected

Extend gutenberg blocks with additional background options

WP Post Background vs Block Background