I'd definately pipe top and bottom borders, either shell or dots. Are you going to pipe a salutation on the top? If not, I'd just sprinkle some more of your chocolate on top. It all depends on what the ocassion is.
I agree it needs borders, I am not good with writing so if it was me I would do more shavings on top sounds like it's a delicious cake though!
Could you just use buttercream to do the borders? Chocolate sprinkled on top would be pretty too though. How about a border of chocolate chips? Or maybe you could add some strawberries to it.
just a thought.
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