Our family enjoys a healthy, nourishing, kefir smoothie every day. For my daughter with Celiac, this has completely changed her bowels and made her so much happier and healthier.
For four children, I use 2 cups whole milk kefir + 2 ripe bananas + 1-2 cups frozen berries + 2 cups blanched spinach + 2 TBS honey.
We tried these without the spinach and the kids all agree the smoothies are better WITH spinach.
There have been a lot of flavor experimentation going on... the favorites are either mixed berries/banana or strawberry/banana.