I wanted to try this out but immediately hit a brick wall. The instructions say:
Activate the WP Masonry Layout plugin through the ‘Plugins’ menu in WordPress. Goto WP Masonry > Shortcodes to create shortcode.
But what the heck does “Goto WP Masonry > Shortcodes” mean? No such thing exists on my site that I can see. So it’s installed and activated, but completely useless at the moment.