We regularly have smoothies for breakfast.  We also regularly have just a little too much – not enough for another serving, but more than we want or need to drink.  I pour these leftovers into popsicle molds and stick them in the freezer.  This way, we (almost) always have healthy popsicles on hand – and in a variety of flavors, to boot.  (Smoothies with some yogurt in them make some of the best popsicles, as the yogurt gives them a creamy texture.)