A super quick way to make nice looking rocks of various styles. I only used an image texture and a normal map. http://ssbump-generator.yolasite.com/ is the link to the normal map generator. There are even some online ones if you don't want to install anything. If you have any questions just ask. http://www.textures.com/ can be used to find textures but I just mainly search rock textures seamless, or for this one sandstone seamless texture.