Why not just make - wait for it - a normal smoothie? Maybe the issue is that people think smoothie, and they think juice, yogurt, and a few strawberries and a half a banana. Well, in my book, that's not a smoothie. IMO, a proper smoothie should have:
Kale
Spinach
Strawberries
Bananas
Blueberries
Mango
Pineapple
...Plus more. The only downside is that there's a bunch of sugar in there too.