You can choose the color of the aggregate and the type of porosity of the concrete. Here's how the options differ:
Medium Porosity: The aggregate pattern is slightly dispersed across the entire surface of the slab, giving a more subtle effect.
High Porosity: The aggregate is in larger clusters in smaller areas of the slab, giving a more distinct and distinctive look.
The aggregate pattern itself is naturally and randomly formed, so there's no way to fully control its placement.