I used a Dessert Bullet to make this nice cream. (Link in Resources) After freezing the bananas and blueberries, I mixed them together in a bowl, and inserted them into the chute and pressed. Voila! Swirls of banana and blueberry in ice cream form. Top with pomegranate seeds, or whatever suits your taste buds.
If you don't have a Dessert Bullet, you can make nicecream in your food processor by adding the bananas and blueberries and soy or almond milk as needed to create a creamy texture.