Place chocolate in a large glass bowl, set aside. In a saucepan heat cream over medium heat, stirring occasionally, until it just begins to boil (you’ll see small bubbles on the surface). Remove cream from heat, whisk in about 1/4 teaspoon food coloring (or more if you wish), then pour it over the chocolate. Let sit for a few seconds, then begin stirring and do so until the chocolate melts.
Let ganache sit for a few minutes, so it thickens and cools a bit, stir occasionally.
Take cake out of the fridge, drop small teaspoons of ganache close to the edge of the cake. Gently push ganache drops over the edge with the back of the spoon, so it drips down. As the ganache slowly slides down the cake, place a few tablespoons on top of the cake (in the center) and spread it towards the edge using an offset spatula.
(All the gaps should be filled and ganache should be smooth. If you see any empty spots, dip the spatula in the remaining ganache and add drops of it to those spots.)
Then do the rest of the decorating: Place mini meringues all around close to the edge of the cake, place macarons in the middle (gently press them in), then take the chocolate bark and stick it into the cake. (You want the bark to have sharp edges. If it won’t stay put, stick in a few toothpicks or place some extra macarons behind it to give it support.) Lastly press some sprinkles around the lower part of the cake.
Before cutting, chill cake for about 1 hour, until the ganache is completely set.
Store cake in the fridge, eat within 2-3 days.