Pop popcorn according to package instructions. Place popped popcorn, pretzels, chocolate covered candies and cereal in a large bowl (remove any unpopped kernels) and set aside. In a microwave safe bowl, melt white chocolate at 30 second intervals, stirring each time until completely melted. Pour white chocolate over popcorn mixture. Spread the coated mixture on a cookie sheet. Sprinkle with Spring themed sprinkles. Do not mix after adding sprinkles as you will coat your sprinkles. Allow mixture to set or dry completely (approximately 30 minutes to an hour.) Once set, break apart and add to individual treat bags or a bowl for all to enjoy.