To make a green smoothie, you will need a banana, 1 2/3 cups milk, 1 1/4 cup fruit and two cups of spinach. You can use any variety of fruit you like including strawberries, blueberries, raspberries, mangos, apples, peaches and pineapple. Blend all of the ingredients in your blender until smooth, the spinach makes it healthy and gives it a green color.