I think I have perfected my (purple) green smoothie. I don't have a Vitamix or BlendTec, just a Cuisenart blender. At first I was throwing everything in and trying to puree or liquify everything at once, but it was so thick that I had to add way more liquid than I wanted, and ended up with a watery smoothie. I finally realized that it's easier to add the chunkier things at the end.
Here is how I make it:
Blend 12oz almond milk and 2 dates. (You could add some flax or any flavoring sat this time as well, like cinnamon).
Add 2 handfuls (around 1 Cup) frozen spinach or kale and blend.
Add a handful (around 1/2 Cup) frozen blueberries. Blend smooth.
Simple, I know, but blending in stages made the whole process so much easier. Hope it helps and you enjoy!