As luck would have it, we have been given 2000+ bricks (with holes) left over from a subdivison. We would like to use them in a walkway. Can we stand them on their long side and use them? is a sand base ok? or should we use concrete? We are using a edging @ a 6-inch depth, with a gravel and 2" sand base planned. We live in the valley part of Chatt.,Tennessee zone 6, and get a few dustings of snow each year.