Everyone likes fruit smoothies, whether they're being served for a quick breakfast on the go or as a snack. Smoothies are cold, sweet and perfect for hiding vegetables. When you get down to it, a good smoothie could probably hide the taste of sawdust (but nobody needs that much fiber). Instead, try blending raw baby spinach, a banana, blueberries, nonfat vanilla yogurt and pineapple or orange juice for a low-fat source of vitamins A, C and E, iron and fiber. The blueberries, which are an excellent source of antioxidants, will produce a rich, purple color while making the taste of spinach completely undetectable. One caveat: Be careful when you add orange juice and strawberries, which combine with the green spinach to create a much less visually appealing brown beverage.