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.

michele.settembre

<p>This plugin was created to make easier the life of people that want to get pictures, images, photos from the web, rather than download your image on your computer and, then, upload it in your media library, you can paste the image url in the field and get it from the web straight in your media library. Afterword you can click to set the post thumbnail and you will find the aquired image in your media library, ready to be inserted in your post.</p>
<p>This plugin is a simple box, activate the plugin, follow the settings link, activate the option to see the new form in the post thumbnail metabox in the post edit page and it’s done!</p>
<p>I created this plugin mainly for me, when I was creating websites I incurred the need to quickly grab some of my photos from another website ands that was the reason of this idea, it is something like creating a tunnel from one site to another to transfer images.</p>


Post Thumbnail from URL

Post Thumbnail From URL is a plugin to quickly import images from the web straight to your Media Library using a public URL.

Custom Background Extended vs Post Thumbnail from URL