Pour the popped corn onto 2 baking sheets lined with a silpat or parchment paper. Remove any unpopped kernels. Mix in marshmallows, Robin Eggs, and nuts.

In a microwave-safe bowl, melt white candy melts on 50% power. Drizzle melted evenly over the popcorn. Using a spatula, toss the popcorn mixture to coat it with melted candy.

Put colored candy melts in three Ziploc bags, microwave candy melts at 50% power for 1 minute. Knead candy in the bag. Continue to microwave and knead at 30-second intervals until smooth and completely melted.

Snip off a small corner of the Ziploc bags and drizzle the melted candy on top of the popcorn.

Let the popcorn rest on the baking sheets until the melted candy is dry.