Place white chocolate chips in a microwave-safe bowl. Microwave just until melted, about 1-2 minutes. Stir until smooth, then spoon tablespoon-sized dollops on top of green candy melts. Use a spoon to swirl the white chocolate and green chocolate together to create a flat surface on top of your chocolate. Tap baking sheet several times against the counter to level. Sprinkle with popcorn, green candies, and sprinkles.