The 3D Textures tool is designed to assist with the creation of textures for jewelry, watches, objets d'art, etc. The tool gives you a set of parameters that you can specify to create random textures on a flat surface starting from an object. In order to do this you first need to create both the flat surface and the object that you intend to use to generate the texture. When satisfied with the result you can use the 3D textured surface you generated as the base for further modeling of your creations, in particular by using the Flow along surface tool.