code: function() {
      this.jsonInit({
        "message0": Blockly.Msg.LOOKS_CHANGEEFFECTBY,
        "args0": [
          {
            "type": "field_dropdown",
            "name": "EFFECT",
            "options": [
              [Blockly.Msg.LOOKS_EFFECT_COLOR, 'COLOR'],
              [Blockly.Msg.LOOKS_EFFECT_FISHEYE, 'FISHEYE'],
              [Blockly.Msg.LOOKS_EFFECT_WHIRL, 'WHIRL'],
              [Blockly.Msg.LOOKS_EFFECT_PIXELATE, 'PIXELATE'],
              [Blockly.Msg.LOOKS_EFFECT_MOSAIC, 'MOSAIC'],
              [Blockly.Msg.LOOKS_EFFECT_BRIGHTNESS, 'BRIGHTNESS'],
              [Blockly.Msg.LOOKS_EFFECT_GHOST, 'GHOST']
            ]
          },
          {
            "type": "input_value",
            "name": "CHANGE"
          }
        ],
        "category": Blockly.Categories.looks,
        "extensions": ["colours_looks", "shape_statement"]
      });
    }
docs: Block to change graphic effect.
  @this Blockly.Block