Put all ingredients in a Blender and blend until smooth. For a Purple Samsara, add a shot of vodka ;). This is a very simple, but tasty drink to enjoy on a hot day.
Tip on Freezing Bananas: Peel as many bananas as you would like to freeze and put them in a freezable container. Squeeze some lemon juice on them to keep them from turning brown, and place in the freezer. (You may want to freeze several, since Bananas, as you may or may not know, will likely be extinct within ten years.)