yes the grid squares can be used either way fill them with soil and grass seed and it gives you a firm grassy surface. but i hate mowing lawns do not get the stripy lawn people at all. i am going to lay them over weedproof membrane and fill them with gravel 7 or 10mm probably local derbyshire gray. that way once i have to go into a wheelchair i will still be able to get around.
that will be the interesting bit as i reckon it will take 3 tonnes of gravel to cover what i want to do.