I can only think of 3 things; 1. Try to find some sort of tinted clear plastic film or sheets to affix to your windows. these would have to be maybe yellow so that they would only allow yellow light in. At this point, going this route you would have to have one color or another coming in, I don't think it would be possible to filter out JUST the green. If you prefer yellow to green then this would do. Or, 2. you could build a white or beige fence that would reflect the color you prefer instead of the green, or, 3. You could explain your dillema to your neighbor and pay him to paint or re-stucco the side of his house.