concrete are removed through to the soil exposing the rebar. This allows the whole driveway to remain monolithic. While still workable, the edges are rolled over giving a natural "stone" look. Finally the surface has a 2-color agent added to the surface in a natural look & the surface was stamped with a slate texture.Between the joints I added 1/2"-to 1" black Tejas rock. One could try grasses.You can see, this process is a bit of an art form.