In the main square of Bologna there is a big Christmas tree that is enlighted by cycling people but I think London wins in that.
Sarah Wigglesworth Architects’ sustainable Christmas tree
What do you get if you cross Christmas with a bicycle? A ‘Tree-Cycle’ sustainable Christmas tree made out of recycled bicycle parts
Sarah Wigglesworth Architects has been commissioned by developers igloo to create a bespoke Christmas tree for Bermondsey Square, London, SE1. The Bermondsey Square Christmas tree is composed of 35 recycled bike wheels, set on a simple structure, in the recognisable shape of a Christmas Tree. The 35 wheels incorporated in the design are on loan from UK charity Re~Cycle who are committed to providing cheap, sustainable transport in Africa. The charity collects redundant bicycle parts to restore bicycles, which are then shipped to Africa for use by local people and health workers coping with the AIDS epidemic.