Philipp15b

This plugin allows you to add your code/text to the headers and footers on all the blogs in the blog network and in the backend of all blogs too.
In addition, it is possible to replace the footer bar text in the backend completely.
You can access the settings under Network Admin -> Settings.

Sitewide (Admin) Header/Footer

Change the header/footer of the front- and backend of WordPress Multisite

Mobilunity

Plugin that allows show banners on all pages or posts just in few clicks without coding and changing post.php or page.php. Upon activation of the plugin user is able to configure:
<h3>Features of Sitewide Coloring plugin</h3>
<ul>
<li>unlimited number of banners</li>
<li>banners for desktop and mobile versions</li>
<li>positioning of banners (below, above, on the right/left)</li>
<li>per-paragraph placement of banners</li>
<li>whether coloring will be shown only on pages, only on posts or both</li>
<li>exclusions and pages/posts where banners will not be shown</li>
</ul>
Plugin also includes a small preview of current configuration.

Sitewide Coloring

Plugin that allows show banners on all pages or posts just in few clicks without coding and changing post.php or page.php.

Sitewide (Admin) Header/Footer vs Sitewide Coloring