One at a time, dunk a rice cake into the melted chocolate. Remove and use a tablespoon to spread or swirl the chocolate into the uneven surface or crevices.
Evenly sprinkle over the toppings. Remember that everything needs to be touching the chocolate (even just a smidge!) to stick.
Repeat with remaining rice cakes and toppings.
Place in the fridge or freezer for the chocolate to harden.