Green smoothie recipes? Would like recipes including fresh spinach?

I'm a big fan of green smoothies but I am growing tired of my typical go-to smoothies. I have fresh spinach in the fridge as well as romaine lettuce, and oranges, strawberries, raspberries, and apples. The only juice I have on hand is orange juice. Any ideas? I need something energizing, low calorie, and VEGAN. no yogurt recipes please