You might except a grander programme from that title, but this is actually a quite simple and straigthforward project. I needed to have a neat visual effect for a WordPress based website I was renovating and at first used the default options to make a gallery. I had five images in the gallery for testing. Because all of the images didn’t happen fit to the same row three were in the upper row and two in the lower. By accident the images made an inverted staircase pattern of two rows. From that I got and idea of creating a complete staircase of three rows by adding one extra row with one image. The images would be picked randomly from a larger gallery.
