Prepare a large rimmed baking sheet or other large pan by lining with parchment paper. Set aside.
Spread popcorn out on lined baking sheet.
In a heat-proof measuring cup, place about 6 oz. of white chocolate candy coating pieces. Microwave for 30 seconds at a time, stopping and stirring occasionally until completely melted and smooth.
Stir in lime zest and incorporate completely. If your coating is too thick, add ½ to 1 teaspoon of coconut oil and stir until a smooth consistency is reached.
Pour melted coating onto popcorn. With a silicone spatula, carefully toss popcorn with candy coating, making sure to coat as much as possible.
Sprinkle crushed graham cracker crumbs over popcorn and gently toss to adhere crumbs to wet coating. Set aside to cool.
Melt the remaining 2 ounces of white chocolate candy coating until smooth, and add 1 drop of green food coloring. Mix to incorporate.
Drizzle onto popcorn and allow to set until hardened and no longer sticky. (To speed up the process, refrigerate for 30 minutes.)
Break up any large pieces before serving or packaging.