"I though of Gatsby's wonder when he first picked out the green light at the end of Daisy's dock. He had come a long way to this blue lawn and his dream must have seemed so close that he could hardly fail to grasp it. He did not know that it was already behind him, somewhere back in that vast obscurity beyond the city, where the dark fields of the republic rolled under the night.
Gatsby believed in the green light, the orgastic future that year by year receded before us."(189)
The green light that has followed us throughout the book has gone from representing Gatsby's unrequited love, to hope, vitality and life. Now, we learn another meaning of the green light - "the orgastic future." Gatsby would stand out in the dark night, looking at the light which cradled all of his will and hope.
Another note would be the "blue lawns" - blue can symbolize one of two things - depression and sadness or Gatsby's deeply romantic dreams and illusions. For me, it represents both. We saw a lot of blue around Gatsby in the book, whether it be in is house or on his servants and I think that emphasized that his wealth was all part of his dream to "woo" Daisy. The blue lawns, could also be referring to the depressing setting of Gatsby's house. The parties were not enjoyable unless you were drunk, and the last one had a hostile, rude atmosphere. Gatsby's house was not full of life, because he himself was empty.