I keep coming back to concrete but the cost is high mostly due to labor and staining because I would like it darker. My stone driveway - the actual 1/8 mile long drive - has been in place for 50 years and is int very good condition. I am thinking that it would be possible to just grade it flat and not have to form it using a thick consistency of concrete like they do on the roads. Is this possible? Is there something that I am not understanding? Maybe it is just the cost of bringing in apiece of equipment like that for a driveway?