My green smoothies these days usually consist of 2-3 cups of greens, 2 bananas, ground flax seed, some hemp protein powder and maybe some other fruit. And sometimes, I just don't like them. But I've noticed that other people tend to put dates or agave in their smoothies, or more bananas (which I feel are the key to a good smoothie). It used to be that the only smoothies I would drink were orange juice blended with bananas (thanks to a lady at a juice stand at the upside down pyramid mall in St. Petersburg, FL near the fancy shmancy hotel and the dolphins) so when I started drinking green smoothies I just added some baby spinach to that. In an attempt to be healthier, I gave up the orange juice, and sometimes will put a whole orange in for the fiber, but it's just not the same sweetness.
So. I shall use less greens when I'm not feeling them. Today, less greens are because all I have is red leaf lettuce. So today's smoothie: 2 bananas, 2 large lettuce leaves, 1 c. grapes, teeny bit of agave and some ground flax seeds. And too sweet!! Ah well. I'll find my middle ground again.