YoFlash's search plugin is able to show images in the search results. Unfortunately, teh default search component from Joomla does not offer this feature. However, with some simple steps it is possible to display images in search results.
A big part of this post are taken from PHOCAs explanation / documentation.
With the help of template overrides you can manage to alter the results display page without hacking teh core joomla component. The original file can be found here: components/com_search/views/search/tmpl/default_results.php
1. Copy all files from "components/com_search/views/search/tmpl" to your template directory in the folder "templates/[YOUR-TEMPLATE]/html/com_search/search
2. Edit the file "default_results.php" in the template folder
The rest is taken from the PHOCA documentation. All credits belong to them.
<?php if (isset($result->image) && $result->image != '') {
echo '<div style="float: left;margin: 5px 10px;"><img src="'. $this->escape($result->image).'" alt="" /></div>';
} ?>
<dt class="result-title">
<?php if (isset($result->image) && $result->image != '') {
echo '<div style="clear:both"></div>';
} ?>
<?php if ($this->params->get('show_date')) : ?>
<dd class="result-created<?php echo $this->pageclass_sfx; ?>">
<?php echo JText::sprintf('JGLOBAL_CREATED_DATE_ON', $result->created); ?>
</dd>
<?php endif; ?>
