The single image gallery is a simple way to display a single image or item in a module that is able to be linked to a lightbox gallery that is able to display the rest of the items available to the module.
Single image example
Clicking on the image below will launch the zentools2 lightbox which contains another 4 images included in the gallery.
Icon Example 4
This module uses the zen-icon zen-icon-comments bottom large secondary1 module class.