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.

Pat Hawks

CAYdenberg

<p>[catthumb id=”CategoryID” link=”true”] will find the most recent post in the specified Category with a featured image and return the thumbnail for that image. If <em>link=”true”</em> is specified, the image will link to the category specified.</p>
<p>You can optionally search custom post types with the <code>post_type</code> attribute, and specify the thumbnail size with the <code>size</code> attribute. IE <code>[catthumb id="CategoryID" link="true" post_type="restaurants" size="full"]</code></p>
<p>The plugin will only search <em>featured images</em>, not <em>attached images</em>. It will not look for images embedded in the post itself, or other attached images. If a category does not have any posts with featured images, this plugin will not return a thumbnail image, even if the category has posts with attached images.</p>


Category Thumbnail

Adds shortcode [catthumb] to embed a thumbnail image for a category.

Custom Background Extended vs Category Thumbnail