murraypicton

Uses the flickr API to select a random image for a specified user. This image is then displayed at the beginning of every blog post and saved so that each post always has the same image.
<h3>Copyright Notice</h3>
Ensure you have the permission to use the flickr user’s photos before using this plugin. The writer of this plugin takes no responsibility for misuse and copyright disagreements.

flickrImg

Put a random flickr image for a specified user as the main image for each post

pekastel

Lets you pick a Creative Commons picture from Flickr and use it anywhere you want on your WordPress installation. The plugin will maintain attribution to the original Flickr author to keep peace with the CC Attribution License.
This plugin makes use of the newest WordPress 3.4 feature that allows to embed html in image captions, and also is backward compatible with older version of wordpress as well.
Features:
<ol>
<li>Search photos from flickr with creative commons license by tag (since version 1.2 you can search by any type of license)</li>
<li>Preview image results.</li>
<li>Define the order of the search results.</li>
<li>Automatically add image caption that links back to the original flickr owner.</li>
<li>Lets you use the standard features provided by WordPress for image editing:
<ul>
<li>Image alignment.</li>
<li>Cropping.</li>
<li>Rotating.</li>
<li>Flipping.</li>
<li>Resizing.</li>
</ul>
</li>
</ol>

Flickr – Pick a Picture

Lets you pick a Creative Commons picture from Flickr and use it anywhere you want on your WordPress installation.

flickrImg vs Flickr – Pick a Picture