Muses of Megret has a simple tutorial on How To Make Heart Shaped Cupcakes. The coolest part is that you a heart-shaped cupcake tin is not required. All you have to do is line the tin with cupcake liners and drop a marble in between the tin and the liner. You can use ball of aluminum foil as an alternative. Be sure to only fill each cupcake liner 1/2 way full to prevent the cupcakes from over flowing. These cupcakes are fun for Anniversaries, weddings, and Valentines day.