For the mango-peach smoothie: Add the mangoes, peaches, nectar and yogurt to a blender and blend until smooth. Add lime juice and honey to taste if needed. Pour into a pitcher and refrigerate until very cold.
For the strawberry-banana smoothie: Combine the strawberries and sugar in a bowl and let macerate for 30 minutes in the refrigerator. Add the macerated strawberries and some of the juices, the frozen banana and yogurt to a blender and blend until smooth. Add lemon juice to taste if needed. Pour into a pitcher and refrigerate until very cold.
Fill each glass half way with the mango-peach and then fill to the top with the strawberry-banana. Mix together the finely diced mango, peach and strawberries in a small bowl and top each glass with some of the fruit for garnish.