I should post some of the smoothie combinations from my favourite restaurant. If you're ever in Toronto and like veggie food, go to Fresh (used to be called Juice for Life). It's excellent, and by UK standards, dirt cheap.
Copy/pasting from the menu (I have one of their cookbooks at home, should look through for real combos/amounts of things):
I'm quite fond of the negril beach, blu lagoon, and zest for life. I should make my way through the menu trying them all
lady bug
strawberry, blueberry, apple
zest for life
kiwi, orange, pineapple
rise & shine
pink grapefruit, orange, strawberry
breathless
mango, strawberry, banana
dragonfly
raspberry, banana, apple
negril beach
mango, coconut milk, banana
blu lagoon
blueberry, mango, banana
first kiss
pineapple, strawberry, banana
pink flamingo
watermelon, strawberry, banana
apple pie (hot)
apple, banana, ginger, lemon, cinnamon