Grea idea for when kale is on sale. freeze greens for smoothie - puree with a little water, use muffin tins (I used ice cube tray each cube is c). Now I will buy the big bags of greens and not worry about space in my fridge.
The best thing I ever did for my health was to take a 7 day Green Smoothie Challenge. I stuck to it completely for 7 days and lost 6 pounds! I couldn't believe how much energy I had and my cravings totally went away. I definitely want to do this again.