Nothing special, really. Mostly following the tutorials posted here. So the process (which I barely modified) is: 1) Start with some basic mesh like a box or cylinder and make it a Dynamesh. Give it some basic shape so it doesn't look like a cylinder. 2) Copy the mesh and place it nearby, changing the shape and everything.…
Unfortunately I don't really know of a guide or tutorial to link to. I'll probably do one in the future, but in the mean time I'll try and break it down as best as I can. The first thing you should do is sculpt and texture your rock like you always do but just a base. It doesn't need to be perfect with amazing detail or…