So what I enjoy doing best is steps and terrace walls; typically I use quarry stones that I select from. I use different grades, paying more for stones that have been carefully split, which is the sort of thing I'll use for stairs. Here in W. Oregon, all the sedimentary rock is young, soft and useless (ol' geezer voice over: "yep, those young'uns are!") so the rocks for building are volcanic, mostly andesite, fine-grained, hard and not bubbly. What I do for myself, or anyone who is willing to pay a bit more, and/or work with me (OSHA, I didn't say that) is mix up a fertile "mortar" of crushed rock, peat, and compost, and put that between the rocks, and in any space big enough I plant Sedums and other native rock plants, strawberries, Penstemons (humming bird's fave flowers) Makes an edible wall. I love putting curves in and creating conversation niches by making sure the top course has good "butt rocks" (not the same as "Butt Rockers") for sitting on. For me, a stepping stone path is with real flat rocks with slightly rounded edges, set in a sand bed with tops in one plane and a fertile mix as above between the stones and shy enough of the top plane that there's room for creeping thyme and things of that growth habit between the stones. That means stones which are 3' thick or so, and heavy enough that they don't jiggle about. I have a walk about to happen again- some of the stones are from great distances and I've used them before other places- and that piece of granite from Cortes Is. is one of them. Another is a piece of Precambrian white marble from Death Valley. I'll see if I can hunt down some pictures to show y'all.