Just 2 weeks ago I finished putting in a driveway here at home using Lilydale Toppings which is a crushed granite. I dunno if it's the same stuff as deco granite or not.

Where I live the ground is hard clay, no topsoil, and the bloke who sold the toppings said to lay it straight on the clay, no roadbase needed. So I put down 75mm over 36 square meters and whacked it down. So far it's holding together well and surprisingly little comes inside on my boots.