Try this smoothie recipe when you are craving something really sweet. It will remind you of a slush from a fast food restaurant or gas station. It also tastes great with blackberries for even more anthocyanin antioxidant action. Anthocyanins are the blue pigment in blueberries, purple grapes, and blackberries. These pigments, which are flavonoids (a type of antioxidant compound) have been shown in studies to protect against cancer, aging, neurological diseases, inflammation, diabetes, and bacterial infections. The more ice, the more slushy it becomes. The slushies from the gas station are not much more than sugar and water. Instead, drink in health with our blueberry grape slush smoothie recipe.