Green was, with the Druids, a symbol of hope and the virtue of hope with a Freemason illustrates the hope of immortality. In all the Ancient Mysteries, this idea was carried out, and green symbolized the birth of a NEW WORLD, the moral creation of the initiate. Hence the NEW WORLD translation of the Holy Scriptures.
On the other hand, the color grey in high-ranking Freemasonry is said to simbolize a 7-year period of tribulation and turmoil.
Given the Masonic origins of the Watchtower Bible & Tract Society, it's quite possible that the worldwide masonic powers to be have already set in motion the wheels of "tribulation" which started with the government shutdown in the US and will end with a Zionist objective that we are yet to see 7 years from now.