If desired, add nuts to any or all of the chocolates. Pour the chocolate into the molds, filling them to the top. Set the sticks in place by inserting them just far enough to be secure within the mold you are using. Set the molds aside to allow the chocolate to set. When set, simply pop out the lollipops.
If you are using molding compound, roll it into a 1/2-inch-thick rectangle on top of a sheet of parchment paper. Using a sharp paring knife, cut out whatever shapes you would like and remove the cutout, leaving the homemade mold. Spray the inside edge of the molding compound with vegetable cooking spray and pour the chocolate into the cut out space. Insert the lollipop sticks and let cool completely before removing the molding compound. When finished, the molding compound can be saved and reused for another day.