My favorite fruit smoothie is a variation of one that Canadian TV chef Michael Smith makes for breakfast. He uses orange juice, I like cranberry.
Fruit Smoothie
blueberries fresh or frozen cranberry juice 1 banana
Puree a handful of blueberries fresh or frozen and some cranberry juice in a blender. Cut in a banana and puree all together. Delicious and very good for you. Sorry, no measurements - just use the proportions you like.