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).

andybruce11

Change the backgrounds colors globally or for a specific page. 
Who are we? This plugin was developed by <a href="https://allcatering.ca/" rel="noopener noreferrer nofollow ugc">Catering Canada</a>, as we needed to change the background color for some of our website pages. After developing the plugin we thought to share it with the community.

Change Background Color for Pages, Posts, Widgets

Change the backgrounds colors globally or for a specific page.

WP Post Background vs Change Background Color for Pages, Posts, Widgets