This all comes down to how concerned you are about carb content.
If that isn' a problem (if you are bulking or a natural ecto) then you could get exotic adding honey, fruit and all kinds of delicious tasting ingredients.
Unfortunately though, to acquire the level of "sweetness" that the average person demands we are usually talking about a huge amount of carbs, in fact to get bulking products up to the ideal level, many companies include about 50% dextrose.