Prepare a baking sheet with parchment paper.
Spread dark chocolate evenly in the pan.
Use a spoon to make dollops of purple and green chocolate towards the middle of the dark chocolate.
Using a knife or lollipop stick, make swirling motions all over the pan to combine chocolates together.
Add decorative sprinkles.
Place chocolate in fridge for at least 30 minutes. Once it is set up, break into pieces and serve.