First you want to line a baking sheet with parchment paper. I used the smallest baking sheet I had. You don't need a big size one.
Then you're going to want to put your chocolate melts in to a microwave safe bowl. Then put them in the microwave until they are all melted. I usually do about 30 seconds at first and keep doing 30 more until it's melted.
Now pour the black chocolate over the parchment paper and spread it out. You can do this however thin or thick you'd like. I like mine to be a bit thinner.
Next you will take the other colors and just drizzle them the best you can over the top of the black chocolate. After you're done drizzling it, take a toothpick to swirl it around to give it that marble look.
Next you want to add the sprinkles over the top of the chocolate. Just sprinkle them around until it looks the way you'd like. I used white, pink, purple, and blue sprinkles.
Now put this in the fridge for at least an hour so it can harden.
Once it is ready, take it out of the fridge. Now I normally use a knife to help break the chocolate apart. You can do this how you want, but a knife works really well. Now that it is all broken to pieces, enjoy!