LONDON.- What do you get if you cross a Christmas tree with a bicycle? A “Tree-Cycle” – A sustainable Christmas tree made out of recycled bicycle parts. Leading sustainable architectural practice 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.