Skewer 4 or 5 (or more, whatever!) grapes on bamboo skewers. Dip the grapes into the dark chocolate and use a spoon to pour the chocolate over the grapes, covering them all, and then let the excess run back into the bowl. Place on a sheet of parchment paper to firm up. Once the dark chocolate is firm, drizzle the white chocolate on top. At this time you can cover the chocolate with sprinkles or sea salt or let it be. These stay firm at room temperature, but they taste the best when refrigerated!