In the late 80's I was just about to finish Berry College in northern Georgia. I saw a ghost late one evening after returning to my dorm. It had been raining, so at first I thought the image was a gathering of fog. As I drove closer, I realized the "mist" was greenish in color, and the form was actually that of a young girl in antique clothing, hovering about a foot off of the ground. I didn't wait around, but fled to my dorm. My roommate thought I was crazy, as did my boyfriend. Later that year, I overheard a guy telling another student of an experience he'd had earlier in the summer with a green ghost speaking to him at the camp he was attending on campus while a camp counselor. After speaking with him for some time, it was concluded that it was indeed the same ghost, and the story of the "Green Lady" was born.
I haven't seen one since, but would love to be "sensitive" to other ghosts - I think.