scibuff

The Twitter Gallery is a WordPress plugin for aggregating images/photos 
posted to twitter. The gallery script searches the public twitter feed 
for photos and images sent by users from around the world.
The initial release supports images posted to twitpic.com, yfrog.com, img.ly, flic.kr, ow.ly/i and twitgoo.com
Everyone can have a photo included in the gallery by updating his/her 
twitter status with a message that includes (one or more) images uploaded to either of the 6 services mentioned above and the twitter hash tag 
 # which is fully customizable through the administration dashboard.
Requirements
<ul>
<li>PHP 5.2.0 or newer</li>
<li>WordPress 3.0 or newer</li>
</ul>

Twitter Gallery

This plugin creates and maintains a twitter image gallery on a Wordpress page

Xoda

Random Post Box is a plugin that lets you place a box anywhere on your blog, with template tag or shortcode, and 
load random posts with an interval and fade effect. It uses jQuery (Ajax) which means that the content is loaded without 
loading the rest of the page. The timings can be set in the admin options-panel.
The template tag is <code><?php random_post_box(); ?></code>. You can also use the shortcode <code>[random-post-box]</code> in a page or post.
<h4>Features</h4>
<ul>
<li>Insert placeholder with template tag</li>
<li>Insert placeholder with shortcode</li>
<li>Set time for displaying the post</li>
<li>Set times for fade in and fade out affect</li>
<li>Exclude or include posts by category</li>
<li>Exclude posts by age (in days)</li>
<li>Use title only</li>
<li>Use post excerpt or bodycontent</li>
<li>Strip tags from body</li>
<li>Show/hide post metadata</li>
</ul>

Random Post Box

The Random Post Box plugin places a box anywhere on the blog, where it loads random posts one-after-the-other.

Twitter Gallery vs Random Post Box