Plus up store bought cupcakes by adding a homemade chocolate heart. Print out heart designs on a piece of paper. Layer a baking sheet with the printed paper and parchment paper. Melt chocolates in a microwavable bowl and transfer to a Ziploc® bag. Cut a hole at the tip of the bag to drizzle chocolate in a heart-shaped pattern. Refrigerate for 2 hours before placing on top of cupcake.