All NextGen Galleries in Lightbox - Loads all galleries on a single page via lightbox instead of going to the actual gallery page. Just add the files appropriately then use this shortcode `[album id=0 template=lightbox]` id of 0 will force NGG to load all galleries. What I did instead however was set the default compact album to use the lightbox…

album-lightbox.php

<?php
// /wp-content/themes/YOURTHEME/nggallery/album-lightbox.php
// To set this theme, go into Gallery > Gallery Settings and change the template to album-lightbox.

/**
Template Page for the album overview

Follow variables are useable :

        $album       : Contain information about the album
        $galleries   : Contain all galleries inside this album
        $pagination  : Contain the pagination content

 You can check the content when you insert the tag <?php var_dump($variable) ?>
 If you would like to show the timestamp of the image ,you can use <?php echo $exif['created_timestamp'] ?>
**/
?>
<?php if (!defined ('ABSPATH')) die ('No direct access allowed'); ?><?php if (!empty ($galleries)) : ?>

<div class="ngg-albumoverview">

<!-- List of galleries -->
<?php foreach ($galleries as $gallery) :
$images =  nggGetGallery( $gallery->gid );
if(!empty($images)) :
?>
    <div class="ngg-album-compact">
        <div class="ngg-album-compactbox">
            <div class="ngg-album-link"  id="<?php echo $gallery->name ?>">
            <?php
            $imgcntr = 0;
                foreach ( $images as $image ) :
                    if ( $imgcntr == 0 ): ?>
                        <a href="<?php echo $image->imageURL ?>" title="<?php echo str_replace("\"", "'", $image->description); ?>" <?php echo $image->thumbcode ?> >
                            <img class="Thumb" alt="<?php echo $gallery->title ?>" src="<?php echo $gallery->previewurl ?>"/>
                        </a>
                        <?php $imgcntr++; ?>
                    <?php else: ?>
                        <a href="<?php echo $image->imageURL ?>" title="<?php echo str_replace("\"", "'", $image->description); ?>" <?php echo $image->thumbcode ?> ></a>
                    <?php endif; endforeach; ?>
            </div>
        </div>
        <h4><a class="ngg-album-desc" title="<?php echo $gallery->title ?>" style="max-width:110px;" href="<?php echo $gallery->pagelink ?>" ><?php echo $gallery->title ?></a></h4>
        <?php if ($gallery->counter > 0) : ?>
        <p><strong><?php echo $gallery->counter ?></strong> <?php _e('Photos', 'nggallery') ?></p>
        <?php endif; ?>
    </div>

<?php endif; endforeach;?>

<!-- Pagination -->
<?php echo $pagination ?>

</div>

<?php endif; ?>

functions.php

<?php
/**
 * Custom function for displaying all gallery images on a single page
 * @param  int  $galleryID
 * @param  string  $template
 * @param  boolean $images
 * @return array
 */
function nggGetGallery( $galleryID, $template = '', $images = false ) {

    global $nggRewrite;

    $ngg_options = nggGallery::get_option('ngg_options');

    //Set sort order value, if not used (upgrade issue)
    $ngg_options['galSort'] = ($ngg_options['galSort']) ? $ngg_options['galSort'] : 'pid';
    $ngg_options['galSortDir'] = ($ngg_options['galSortDir'] == 'DESC') ? 'DESC' : 'ASC';

    // get gallery values
    $picturelist = nggdb::get_gallery($galleryID, $ngg_options['galSort'], $ngg_options['galSortDir']);
    return $picturelist;
}