Theme Modus, created by rvelices, will bring a modern look to your Piwigo: big square thumbnails for your albums, horizontal menu bar with drop down menus, automatic size selection, modern thumbnail display (à la GThumb+). Modus is ready for high density pixel screens (retina-like) with specific thumbnails and SVG icons.
Modus is a responsive theme. This technical word means that the display will automatically adapt if you visit your Piwigo with a tablet, a smartphone or a big screen. Modus comes with 5 color schemes out of the box.
Here is a tip for users who want to give a try without breaking their current theme: activate this theme but don’t make it the default theme immediately. Edit your user and make it use Modus, then you can see if it looks nice on your Piwigo. Then you can set Modus as default theme for all users!