Drinks
Simple universally-liked green smoothie
Even the green-smoothie averse child likes this one! For how and when to have smoothies, see here.
Drinks
Creamy and child-friendly green smoothie
Two of my three children like this creamy green smoothie, the other is not a green-smoothie man.
Recipes
Fresh and zingy green smoothie
I think this fresh and zingy green smoothie is just wonderful. It is more of an adult smoothie than a child one. For the pros and cons of drinking smoothies, see here.