Green is considered the traditional color of Islam. There are
several reasons for this. First, Muhammad is reliably quoted in a
hadith as saying that "water, greenery, and a beautiful face" were
three universally good things In the Qur'an, sura Al-Insan,
believers in God in Paradise wear fine green silk. Also, Al-Khidr
("The Green One"), is a Qur'anic figure who met and traveled with
Moses.
(For Example) The Libyan flag is
completely green, in honor of Islam's veneration of the color.