model.json

{
   "elements": [
      {
         "from": [ 0, 0, 0 ],
         "to": [ 16, 16, 16 ],
         "faces": {
            "up":    { "uv": [ 0, 0, 16, 16 ], "texture": "#top",    "cullface": "up",  "tintindex": 0 },
            "down":  { "uv": [ 0, 0, 16, 16 ], "texture": "#stone",  "cullface": "down" },
            "north": { "uv": [ 0, 0, 16, 16 ], "texture": "#stone",  "cullface": "north"},
            "south": { "uv": [ 0, 0, 16, 16 ], "texture": "#stone",  "cullface": "south"},
            "west":  { "uv": [ 0, 0, 16, 16 ], "texture": "#stone",  "cullface": "west" },
            "east":  { "uv": [ 0, 0, 16, 16 ], "texture": "#stone",  "cullface": "east" }
         }
      },
      {
         "from": [ 0, 0, 0 ],
         "to": [ 16, 16, 16 ],
         "faces": {
            "north": { "uv": [ 0, 0, 16, 16 ], "texture": "#northOverlay", "tintindex": 0, "cullface": "north" },
            "south": { "uv": [ 0, 0, 16, 16 ], "texture": "#southOverlay", "tintindex": 0, "cullface": "south" },
            "west":  { "uv": [ 0, 0, 16, 16 ], "texture": "#westOverlay",  "tintindex": 0, "cullface": "west"  },
            "east":  { "uv": [ 0, 0, 16, 16 ], "texture": "#eastOverlay",  "tintindex": 0, "cullface": "east"  }
          }
      }
   ]
}

states.json

{
   "forge_marker": 1, // Note to the Forge Json loader to tell it what version it is, thus what features it supports.
   //thus what features it supports. It also acts as a magic marker for telling this appart from the vanilla format.
   "defaults": {
      "textures": {
        "top":     "tfc2:blocks/GrassTop",
        "overlay": "tfc2:blocks/GrassSide"
      },
      "model": "tfc2:grass"
   },
   "variants": {
      "stone": {
         "andesite":   {"textures": {"stone": "tfc2:blocks/soil/Dirt Andesite"  } },
         "basalt":     {"textures": {"stone": "tfc2:blocks/soil/Dirt Basalt"    } },
         "blueschist": {"textures": {"stone": "tfc2:blocks/soil/Dirt Blueschist"} },
         "chert":      {"textures": {"stone": "tfc2:blocks/soil/Dirt Chert"     } },
         "claystone":  {"textures": {"stone": "tfc2:blocks/soil/Dirt Claystone" } },
         "dacite":     {"textures": {"stone": "tfc2:blocks/soil/Dirt Dacite"    } },
         "diorite":    {"textures": {"stone": "tfc2:blocks/soil/Dirt Diorite"   } },
         "dolomite":   {"textures": {"stone": "tfc2:blocks/soil/Dirt Dolomite"  } },
         "gabbro":     {"textures": {"stone": "tfc2:blocks/soil/Dirt Gabbro"    } },
         "gneiss":     {"textures": {"stone": "tfc2:blocks/soil/Dirt Gneiss"    } },		 
         "granite":    {"textures": {"stone": "tfc2:blocks/soil/Dirt Granite"   } },
         "limestone":  {"textures": {"stone": "tfc2:blocks/soil/Dirt Limestone" } },
         "marble":     {"textures": {"stone": "tfc2:blocks/soil/Dirt Marble"    } },
         "rhyolite":   {"textures": {"stone": "tfc2:blocks/soil/Dirt Rhyolite"  } },
         "schist":     {"textures": {"stone": "tfc2:blocks/soil/Dirt Schist"    } },		 
         "shale":      {"textures": {"stone": "tfc2:blocks/soil/Dirt Shale"     } }
      },
      "north": {
         "true":  {"textures": {"northOverlay" : "#top"    } },
         "false": {"textures": {"northOverlay" : "#overlay"} }
      },
      "south":{
         "true":  {"textures": {"southOverlay" : "#top"    } },
         "false": {"textures": {"southOverlay" : "#overlay"} }
      },
      "east":{
         "true":  {"textures": {"eastOverlay" : "#top"    } },
         "false": {"textures": {"eastOverlay" : "#overlay"} }
      },
      "west":{
         "true":  {"textures": {"westOverlay" : "#top"    } },
         "false": {"textures": {"westOverlay" : "#overlay"} }
      }
   }
}