We believe God created the Heavens and the Earth, that includes the colors, and they all have Biblical meanings!
The Biblical color of green symbolizes eternal life, new growth, renewal, and resurection since it is the color of vegetation as we see in Psalms 1:3:
The color green is made by combining yellow, the color of trials, and the color blue, the color of the word of God and His healing power!
It is no coincidence that springtime is a season rife with greenery and new growth, and it's also the time we celebrate the Resurrection during Easter.