My university have a little contest to see which residence can decorate their reception area using juice bottles. I made a little quiz game (https://hackaday.io/project/11033-environmental-quiz-game), and some random other stuff, but I thought some greenery might be nice. Behold:

The string it hangs from is also made from bottles. I don't know how applicable this is to the real world but scaled up it could be cool for hanging from a fence...