To me it looks like blank icons that are put around the icons in the middle. Which of course requires JB, as you can see per the icons used.
Looks like Iconoclasm does not allow you to freeform move the icons around. Is gridlock any better for this type of tweak.
Gridlock allows you to place the icons where you want within the specified 4x4 grid. The tweak the op is referencing is on a 5x5 grid, which I believe iconoclasm allows for, but also has preset patterns like ring, X, and so on.
But with the dock like it is in the picture, my guess is this is a theme tweak.