Place defrosted blueberries and 2 tablespoons agave or honey in a blender and puree until smooth.
Pour the blueberry puree 1/3 way up each popsicle mold and freeze for 30-45 minutes.
Combine the yogurt, milk, and 2 tablespoons of agave or honey in a bowl and whisk until smooth.
Pour yogurt mixture 2/3 way up the popsicle molds on top of the blueberry mixture, gently tap to even out the yogurt layer, and freeze for another 30-45 minutes.
Place defrosted raspberries and 2 tablespoons agave or honey in a blender and blend until smooth.
Finish the popsicles by pouring the raspberry puree over the yogurt, place sticks in and freeze 6 hours to overnight, until frozen through.
*Because all popsicle molds are different sizes, you may have left overs. You can refrigerate the remaining berry purees and use as toppings for yogurt, granola, pancakes, etc.