We put together a small demo to show easy it is to start creating with the Foundation Grid! We've used visibility classes, a medium grid, and even source ordering. You can play with this Codepen yourself: go ahead and fork it, change it, enjoy it!
Similar to Masonry, but with less heavy javascript. This particular version is limited to just square and 2:3 tall images, so it's definitely not as flexible as masonry, just snappier. All positioning is done in CSS, with just a single Javascript loop over the elements to update the classes. Note that bad images would expose the background.