yu-ji

<p>You can post with flickr photo, on visual editor toolbar.<br />
It’s very interactive interface than other plugins.</p>
<p>The plugin support the following languages.</p>
<ul>
<li>English</li>
<li>Japanese</li>
</ul>


WordPress Media Flickr

You can post with flickr photo, on visual editor toolbar.

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.

WordPress Media Flickr vs Custom Background Extended