Smoothie stands are popping up like espresso bars all over the country, but these refreshing drinks are a cinch to make at home. It takes just minutes to whip up a smooth concoction of succulent blackberries, sweet blueberries, chilled grape juice, and rich vanilla yogurt. Or to savor a juicy mango combined with ambrosial buttermilk, zesty fresh ginger, and tart lime juice. Smoothies is bursting with tempting suggestions for adventurous mixtures of fruits, flavorings, sorbets, yogurts, soy milks, and other deliciously healthful ingredients zinging with energy.