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For some, it's also political -- a way to leave their mark on a city they feel has turned its back on them.
CNN: Wall art masquerades as class war
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But when he at last decides whether to promote Mr Mandelson, the prime minister will be all too aware that his courtier is a man of many talents, of which one is held to be a talent for betrayal and that among those who feel in some way betrayed by him are the chancellor and the deputy prime minister.
ECONOMIST: The meaning of Mandelson
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"As much as it's an effective, common-sense source of some sustainable electricity, it's also a great way for people to engage with the issue of sustainability ... to feel like they are part of the solution in a very immediate, fun and visual way that doesn't make you do anything you wouldn't already be doing, " said Miller.
CNN: Green sidewalk makes electricity -- one footstep at a time