$images = get_post_meta($post->ID, 'ecpt_repeatable', true);
if($images) :
    foreach($images as $image) :
        echo '<a href="' . $image . '" rel="lightbox"><img src="paht/to/timthumb/timthumb.php?src=' . $image . '&h=100&w=200&zc=1" class="project-image"/></a>';
    endforeach;
endif;