spoilt for choice
use different chocolates; plain, white, milk, strawberry.
cake toppers; butterflies, pearls, sugar crystals, popping candy
set up different ban maries for your chocolate and melt your chocolate
Empty cake toppings and decorations into different bowls
Stab each marshmallow with a lolly stick
Slice the bottom off a couple of baking potatoes and cover in tin foil
Once chocolate is melted dip a marshmallow into the chocolate, then into the topping of your choice. Stick the lolly stick end into the potato and when full put somewhere cold to set.
The clean up can be fun as there will be molten chocolate and toppings left!