Pre-heat the oven to the lowest temperature it will go - around 120-170 F. Place wax paper on a baking sheet.
Place chocolate bars on the prepared sheet. Bake for about 5 minutes.
Melt the pink candy melts, purple candy melts, and blue candy melts in separately bowls in the microwave for 30 second intervals, stirring in between. Plop the pink evenly onto the melted white chocolate.
Once everything is melted, plop the pink, blue and purple evenly onto the melted white chocolate.
Using a cookie stick, swirl the chocolates together. You'll want to avoid over mixing because it'll just turn into one color versus swirls.
Sprinkle the chocolate with M&M's and mini eggs (or whatever toppings you've chosen). Finish with the sprinkles.
Allow the chocolate to harden at room temperature for a couple of hours - or overnight. You can put it in the fridge for an hour to make it harden quicker, but keeping it in the fridge for too long may lead the candy to condensate and ruining the color.
Gently remove the chocolate from the pan by lifting the wax paper edges. Place on a cutting board and cut into whatever sized square you like. You can also just break it up with your hands instead of a knife.
If you're giving this Easter chocolate bark out as gifts, I recommend using cellophane bags and twist tie bows to make it special!