I started making them myself a few weeks ago, and I love it! Here's the basic recipe I use.
1 cup flavored Kefir (I usually use strawberry or peach because that's what they have at Kroger)
1 large handful of greens (I've used kale, swiss chard, and spinach)
1/2 cup fruit (raspberries, strawberries, mango, etc)
1 Tbsp black chia seeds (for fiber to feel full)
1 Tbsp flax seeds (protein for sustained energy)
Blend on low, then high until smooth. Add 1 cup ice if you like yours chilled. Blend on high until all ice is blended.
So, depending on what fruit you add, the smoothie will probably be brown or gray. Not green. But that doesn't bother me. I feel great getting in so many fruits and veggies first thing in the morning. I do find that sometimes I need a mid-morning snack when I just have a smoothie, so I keep Autumn Wheat Kashi at my desk to munch on.