some ideas

I've been thinking about putting together a collection of photographs for an upcoming art show with ELP, showing a greener east london.
My idea was to display buildings, streets, urban landscapes featuring greenery, plants growing on the side of buildings, street trees, urban oases in unexpected places, vegetation sprouting out of dusty corners of concrete - an urban jungle, literally.
I want to produce a montage or collage of different views of east ldn, all featuring urban greenery of some kind. How does nature fit into urban space, how does it find ways to sprout up out of nothing - from clumps of earth to tiny pockets of dust withing built up spaces. What makes nature take over man made constructions, streets or unkempt places? Why do we even try to fight this?
As much as 'green roofs' and permaculture are a beautiful and welcome advancement in dense urban design, it does remain an irony that we want to contain, control and re-green spaces and add them onto closely determined areas. Urban nature is there to stay and flourish, whether we like it or not.