Add blueberries to a food processor and blend until smooth.
Put the blueberry puree into a medium size bowl and set aside.
Add strawberries to a food processor and blend until smooth.
Put the strawberry puree into a medium size bowl and set aside.
Make the vanilla yogurt base by whisking together the vanilla yogurt, whipping cream, and sugar until sugar has dissolved in a medium mixing bowl.
Divide the vanilla yogurt/cream mixture between the fruit purees and mix well.
Now you can start to assemble your popsicles by pouring into molds.
If you would like to layer your popsicles, fill up your popsicle molds about ½ of the way with the strawberry flavor and freeze for 30 mins (just to help it set a bit).
While you are waiting for each layer to freeze, put the blueberry mixture in the refrigerator until ready for use.
Freeze for 3-5 hours until solid or overnight.