I wouldn't use milk in so many of them. I prefer water as the base in most of my green smoothies. I like the general recipes and the protein breakdown at the bottom. 25 Three-Ingredient Smoothie Recipes I'd use low carb versions but these are great ideas!
Not all of these are healthy substitutes in my opinion, but some are, so use your own judgement. 20 Unique Healthy Food Alternatives --I'm interested to read about some of these things, and I know some of the substitutions only work in some circumstances.