Jason Zhao

<p>A simple ‘post title color’ plugin that lets you select the color of your post title manually.</p>
<p>Features:</p>
<ul>
<li>Add a color picker just under your post title in editor mode</li>
<li>Option to reset all colors to default with one click</li>
</ul>


Colorful Post

Great plugin

A simple 'post title color' plugin that lets you select the color of your post title manually.

Justin Tadlock

<p>A plugin for allowing users to set a custom background on a per-post basis.  This plugin hooks into the WordPress <code>custom-background</code> theme feature and overwrites the values on single post views if the post has been given a custom background.</p>
<h3>Features</h3>
<p>This plugin creates a custom meta box on the edit post screen.  From that point, you can select a custom color and/or image.  If you select an image, you’ll be presented with additional options for how the image appears on the site.</p>
<h3>Requirements</h3>
<p>Your theme must support the core WordPress implementation of the <a href="https://codex.wordpress.org/Custom_Backgrounds" rel="nofollow ugc">Custom Backgrounds</a> theme feature.</p>


Custom Background Extended

Allows users to create a custom background on a per-post basis.

Colorful Post vs Custom Background Extended