Line a baking sheet with a silicone mat or parchment paper.
Add the blue, pink, green and yellow candy melting wafers to separate microwave-safe bowls. Microwave each bowl separately for 30 seconds. Stir, then microwave for 30 more seconds or until just fluid. Melt the white chocolate chips in a separate microwave-safe bowl at 70 percent power for about 1 minute. If needed, microwave at 70 percent in 10-second intervals until fluid.
Pour the white chocolate onto the silicone mat and spread thin with an offset spatula into a square or rectangle.
Using a small spoon, drop and drizzle the assorted melted candy wafers over the top of the white chocolate. Then, take a skewer or toothpick and drag the color around to make swirls. Refrigerate to set up, about 1 hour.
Break the chocolate bark into pieces and serve. Store in an airtight container.