Put the candy melts in a microwave-safe bowl (separated by colors) and melt per directions.
Drizzle some of the red candy melts over a few of the molds and try to do two that are similar so that when you put them together, they match up. Have fun and be creative.
Put the molds in the freezer for 5 minutes.
Take them out of the freezer and put 1 tablespoon of the melted white candy or the green candy into one half of the molds. Spread out using the back of your spoon and get the chocolate up the sides as well. Leave it thick. Do this to all of the mold halves.
Put the molds in the freezer again for another 5 minutes.
Take them out of the freezer and tap the sides gently. This will help loosen the chocolate to take out of the molds.
Fill 1/2 of the molds (6) with 2 tablespoons of the hot chocolate mix and up to 8 mini marshmallows.
Heat a plate to where it gets warm in the microwave and put one of the empty chocolate bomb halves open side down on top. Leave it for 10 seconds so it starts to melt.
Once it melts a bit, press it down on the other half of the matching mold. This will make a complete circle.
Decorate by adding sprinkles or anything you desire.
Put a dollop of the melted chocolate on top of the bomb and press a Rolo candy on top.
Put them back in the freezer for 5 minutes.