dummy thumbs

<div class="grid-cell">
    <a class="project-link-wrap" href="http://path/to/external/site" target="_blank">
        <div class="portfolio-item type-photo">
            <div class="overlay">
                <div class="title-box">
                    <div class="title-wrap"><h2 class="project-title">Title goes here</h2></div>
                </div><!-- /.title-box -->
            </div><!-- /.overlay -->
            <figure class="item-media">
                <img src="http://path/to/the/thumbnail/image">
            </figure><!-- /.item-media -->
        </div><!-- /.portfolio-item -->
    </a><!-- /.project-link-wrap -->
</div><!--  /.grid-cell -->