Last year [2010], David Keen circulated a version of the Chocolate Nativity to folks looking for an idea for an all-age  Christmas.
As my local shops had a few different chocolates to the ones in the story I received, I adapted it a little.
If it’s any use to anyone, please do borrow it. You may need to adapt it to local varieties of chocolate!
:: UPDATE ::
Ooops.
It transpires that I may have done an Emo Philips, as it may be that Stewart Henderson & J.John published a version of this a few years ago:
