Melt the white candy melt in the microwave according to the packet's instructions
Lay a sheet of wax paper on a baking pan or cutting board
Pour the white chocolate on the wax paper spreading it out.
Place 4-5 drops of each food coloring randomly on the white candy melts and swirl the food coloring around with a skewer or a chopstick, anything slender.
Generously shake your sprinkles on top.
Add the popcorn.
Let it harden and break into pieces.
You could add all kinds of things to your bark. Be creative. Nuts, seeds, candies, and cereal would all make great toppings.