Guess it depends on your deffinition on color. You probably won't find an all dark grass green one. And are we considering peristome also or just pitcher body? Color also tends to change as pitchers age. They can also be affected by the environment they develope in. ie light level and temperature.
Will just reiterate that N. ventricosa will have some wings as juvenile pitchers but they will quickly dissappear when the plant starts forming normal lower pitchers.
anyway.. here is a 'green' one imo. It does get a little less green with age...