I have block with image so the easy way it's to create a content type. I have node--nodeName.tpl.php where I built correct DOM.
But this is slider, and all nodes embedded in one div with classes
block-system-main block block-system
I have to initialize slider. For this I need unique parent class\id
This is beginning of my node--nodeName.tpl:
<div class="<?php print $classes . ' slick_hero ' . ' ' . $zebra; ?>">