I am REALLY trying to get my son to eat green smoothies. He is very selective when it comes to textures...so I started with a more sweet green smoothie and had him pick the fruit.  Here is what was in it!!
3 c spinach
2 c apple 100% pure juice
1 c frozen cantaloupe
3 c frozen strawberries
1 banana
It was delicious! It made approximately 1 1/2 quarts (plenty for at least three people!) 605 calories.  My daughter gobbled it up, but the smoothie was not "red" enough for my son, so I let him make another one...no greens in it, but he loved it and drank quite a bit! It's a start, right? This is what was selected to put in my son's RED smoothie:
1 cup frozen cantaloupe
2 frozen red plums
1 cup apple 100% pure juice