drain the can of blueberries, reserving juice. set aside 1/3 cup of the blueberries. in a blender, puree the remaining berries and 1 tablespoon of the juice until smooth. fold in the reserved berries.
in a small bowl, whisk together the yogurt and milk. in pop molds or paper cups, alternately layer 2 rounded tablespoons of the yogurt mixture and 1 tablespoon of the blueberry mixture. swirl with a knife.