This plugin allows the creation of tag clouds based on GIF images.
Each word in the taglist is converted to an image. The images may vary in size, orientation and color. The images are then positioned in a condense way, resulting in <a href="http://www.wordle.net" title="Wordle" rel="nofollow ugc">Wordle</a>-like tag-clouds.
To use the image-style tag-clouds set the format parameter of <code>wp_tag_cloud</code> to <code>image</code>. For convenience a shortcode is provided <code>[imagecloud]</code> that will insert the tag-cloud with the image format option set anywhere within a post or page. The imagecloud shortcode will accept all arguments that <code>wp_tag_cloud</code> accepts plus the few additional ones described below.
To control the image creation a few extra options are provided that may be provided with <a href="https://codex.wordpress.org/Template_Tags/wp_tag_cloud" title="Template Tags/wp_tag_cloud" rel="nofollow ugc"><code>wp_tag_cloud</code></a> or the <code>[imagecloud]</code> shortcode. These are:
<ol>
<li>fgcolor: The color of the texts in the images. Must be in the format “#AABBCC”.</li>
<li>fgcolor2: A second foreground color. When this is set, the tag text color will be a color between fgcolor and fgcolor2, depending on the tag count (occurance). Must be in the format “#AABBCC”.</li>
<li>bgcolor: The background color of the texts. Must be in the format “#AABBCC”.</li>
<li>transparent: set to true if you wish to make the image transparent. Do not forget to set the bgcolor also to prevent strange text-edge colors as the texts will be anti-aliased.</li>
<li>margin: set to the amount of pixels added around each tag.</li>
<li>font: set to the file location or url of the TrueType font (TTF) file to be used to create the tags.</li>
<li>percentup: percentage of words that is to be rotated 90 degrees.</li>
</ol>

ImageCloud

This plugin adds a new format to the wp_tag_cloud function, allowing for image based -- Wordle-like -- tag clouds.

skipstorm

This plugin adds a tag cloud widget where you can select multiple tags at once.
ATTENTION! This is a totally different plugin so if you’re updating from the version 0.6.x you’ll have to configure it again. 
Visit the plugin homepage to download the old version if you want to downgrade.
<h4>Update</h4>
1.0.2 
* Bug fix for utf8 slugs thanks to Alexandros 
* Bug fix + template functions, check comments on plugin homepage
1.0.1 
* Bug fix about random order
1.0 
* Now is a multi instance widget 
* Supports modules 
* Added wp cumulus module (flash file courtesy of weefselkweekje and LukeMorton) 
* Any tag size has it’s own css class allowing a better customization 
* Added several options
0.6.2 
* Removed bug causing some tags not to be displayed, thanks to Felipe from turismocoquimbo.com
0.6.1 
* This version removes the tags that will lead to no articles in the add tag list. 
You might want to install wp-cache to avoid performance issues.
<h4>System requirements</h4>
I’ve only tested this plugin on wordpress 3.0 but it should work down to version 2.8 
This plugin requires php version 5.0 or above
<h3>Developers</h3>
This plugin supports modules, check out the files in modules folder if you want to create your custom cloud style.

Sk Multi Tag

This plugin adds a tag cloud widget where you can select multiple tags at once.

ImageCloud vs Sk Multi Tag