Chaoswolf

Enable to create colored Boxes to highlight your content
The following boxes are available at the moment
<pre><code>[greenbox]this is a test[/greenbox]

[redbox]this is a test[/redbox]

[bluebox]this is a test[/bluebox]

[yellowbox]this is a test[/yellowbox]

[tealbox]this is a test[/tealbox]

[purplebox]this is a test[/purplebox]

[orangebox]this is a test[/orangebox]
</code></pre>

Farbige Boxen Shortcodes by Mediaoase

Enable to create colored Boxes to highlight your content

Marcin Pietrzak

Display cool, animated fly-out or fade box with related content.
When a reader scrolls to the bottom of a single post, page, or custom post type, an animate box will be shown allowing the reader to select the previous or random available post or posts in the selected configuration:
<ol>
<li>Just previous</li>
<li>Previous in category</li>
<li>Previous in tag</li>
<li>Random</li>
<li>Related using YARPP (only post/pages)</li>
</ol>

upPrev

Great plugin. Works great, lightweight and doesn't take a lot of resources to manage. 

Great Plugin

Display cool, animated fly-out or fade box with related content.

Farbige Boxen Shortcodes by Mediaoase vs upPrev