Blend strawberries in a blender on high until smooth. Place 1/2 cup strawberry puree in the bottom of 4 hurricane or double rocks cocktail glasses. Rinse blender and return to motor base. Place remaining ingredients in blender and blend on high until smooth. Pour pina coladas into glasses on top of the strawberry puree. The puree will run up through the pina colada, making a lava flow effect.