Once the entire cake is firm, gently lower the bottom of the pan into a bowl of warm water to loosen the parchment paper and lightly melt the edges of the ice cream cake. Place a cake plate over the top of the pan. Gently turn the cake pan and plate upside down, and shake gently to loosen. It should plop onto the cake plate. OR, if you use a springform pan, gently release the form (after dipping in warm water to loosen), and place the cake onto a cake plate, while leaving the springform base in place for easier transfer. Either serve immediately, or refreeze the whole cake until ready to serve. Decorate with whipped cream, berries and sparkler candles.