Modified Version for V6.1

gistfile1.php

SQL:
images int(11) unsigned DEFAULT '0',
=======================================================
TCA
....
'images' => array(
	'exclude' => 0,
	'label' => 'images',
#	'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig('images'),
        'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig(
          'image',
  	      array(
	        'maxitems' => 4,
	        'minitems' => 0
	      )
),
...
============================================================================
Model:
/**
 * images to use in the gallery
 *
 * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference>
 * @lazy
 */
protected $images;

/**
 * __construct
 *
 * @return AbstractObject
 */
public function __construct() {
	$this->images = new \TYPO3\CMS\Extbase\Persistence\ObjectStorage();
}

/**
 * sets the Images
 *
 * @param \TYPO3\CMS\Extbase\Persistence\ObjectStorage $images
 *
 * @return void
 */
public function setImages($images) {
	$this->images = $images;
}

/**
 * get the Images
 *
 * @return \TYPO3\CMS\Extbase\Persistence\ObjectStorage
 */
public function getImages() {
	return $this->images;
}
==============================================================================
Fluid View (this is a Partial, providing all images with a link to open it in a lightbox, classic clickenlarge):
<f:for each="{images}" as="image" >
	<a href="{f:uri.image(src:image.uid,treatIdAsReference:1)}" class="lightbox" rel="gallery">
		<f:image src="{image.uid}" alt="{image.originalResource.title}" width='101' height="67" treatIdAsReference="1"/>
	</a >
</f:for >