Hi
Seblod have a masonry template...
Create a list with this template and assign to menu item.
This template comes with masonry.js and the other js that helps it ... images loaded or something like that.
I created a template called Slicked List that has a position 'Above' that is great for masonry as it allows you to add fields within your list but precede your list items.
Masonry requires this
ie
ul
- li.grid-sizer (position above)
- li.grid-item (list item)
- li.grid-item (list item)
- li.grid-item (list item)
But you have to add masonry yourself
Bucklash