Andy Charrington

Easily add background options on a per page/post basis.
Currently the plugin includes the following features-
<ul>
<li>Add a background image</li>
<li>Options for vertical & horizontal repeating</li>
<li>Fade out the bottom edge of your background image</li>
<li>Choose background colour</li>
<li>Child pages of a page with a custom background will inherit the parent page background settings.</li>
</ul>

Background Per Page

Background Per Page allows you to set a custom background per page (or post) as well as set up a default background for all other pages/posts.

lunarmobiscuit

Per Post Editors is a plugin that adds to the WordPress permissions models, allowing you to assign specific users to be editors 
of specific posts or pages.
To summarize:
<ul>
<li>Allow specific users to edit a post or page</li>
<li>Editors are assigned directly inside the post itself – there are no other admin settings</li>
</ul>
<h3>Documentation</h3>
Full documentation can be found on the <a href="http://lunarmobiscuit.com/plugins/per-post-editors/" rel="nofollow ugc">User Permissions Page</a> page.

Per Post Editors

This plugin provides the ability to configure editors per-post.

Background Per Page vs Per Post Editors