Printednest wants to give birds 3d printed nests inside cities. They want to have our feathered little friends inhabit cities once again. Ok they will crap on you from above, but nature is GOOD ... right!?
Their designs look very cool! And the designs are already in 4th generation ...
Project homepage: http://www.printednest.com/
They are building a community and want more people to join them. You can build your nest and pin it on a map, even live feed from it ... Currently they have 40 nests in 27 cities in 7 countries.