In a microwave safe bowl, melt 6 oz of of melting chocolate in 30 second intervals until melted. Divide the chocolate in half.
Using candy coloring, color one half pink and one half purple. Fill each silicone shell cavity about half way up. Set aside to let the chocolate set.
Prepare a fresh sheet of parchment paper on a baking sheet or table.
In a deep microwave safe dish, melt 20 oz of of melting chocolate in 30 second intervals until melted.
Use candy coloring to color the chocolate light green.
Dip half of each rectangle rice krispy in the green chocolate. (It is easier if you tilt the bowl slightly to one side to pool the chocolate when you dip). Set on prepared parchment.
Use remaining chocolate to attach seashells to the non-dipped part of the rice krispy.
Set mermaids aside so the chocolate can set.
Prepare a piping bag with a small round piping tip. Set aside.
In a microwave safe bowl, melt 6 oz of of melting chocolate in 30 second intervals until melted.
With candy coloring, color this chocolate a dark green.
Place chocolate in prepared piping bag.
Pipe small āuā shapes across the light green chocolate.
Allow chocolate to set before serving.