Not yet a supported GeoServer OutputFormat:
"Minecrafting with OS OpenData - We have created a Minecraft world made with digital map products - freely available as OS OpenData - The world consists of more than 22 billion blocks representing over 220,000 square kilometres of mainland Great Britain and surrounding islands. We don't include Northern Ireland, the Channel Islands or the Isle of Man, because they are mapped by other organisations."
http://www.ordnancesurvey.co.uk/innovate/developers/minecraft-map-britain.html
"Inspired by the Ordnance Survey (OS), BGS has reproduced the 2D geology of mainland Great Britain and surrounding islands within the world of Minecraft. This map shows the OS map data on the surface and the rough position of real geology beneath, repeated down to the bedrock."
http://www.bgs.ac.uk/minecraft/#/-67204/64/99527/-11/0/0
--
Ben Caradoc-Davies <Ben.Caradoc-Davies@anonymised.com>
Software Engineer
CSIRO Mineral Resources Flagship
Australian Resources Research Centre