Create a bottom layer of melted Bournville dark chocolate and top it with mango mousse.
Add some broken chunks of Bournville dark chocolate bark to the mousse for little bits of chocolate.
Create shards with Bournville chocolate bark to decorate the mango mousse.
Drizzle melted Bournville dark chocolate over the mango mousse to bring a dark and rich contrast.
Mix melted dark chocolate with cereals or crushed nuts to make a chocolatey crumble topping for mousse.