Idk about green but try to fill half of the blender with strawberries, a handful of raspberries and a small banana, tastes great!
I'm sorry, I don't know any recipe of smoothie. But I've heard that smoothie gives you much more fructose for once than common fruits. Usually you don't eat 6 apples for one time, but in smothty you can drink 6 apples a time. So it may cause gaining extra weight and problems with sugar level in blood.
Yes, the ingredients for a green smoothie that tastes great are frozen bananas, frozen fruit, spinach, and protein powder.