This gallery utilises Sparkle’s Popups to create a gallery that can be clicked through when images open in the lightbox.  Each image lightbox contains a next and previous icon to scroll back and forth between the images. When the last image is reached, continuing forward will open the first image again. Likewise, clicking on the previous image icon on the first image will open the last image - creating a revolving lightbox. The gallery can be triggered from any image in the grid.

This is easy and quick to do, and gives you great flexibility in how you display your thumbnails on the page.