Old weathered balcony flooring for a condo gives it a rustic charm that a lot of the tiny tiles and squares just doesn't do. Here's a photo showing two different examples and while I like the one on the bottom, I love the one on the top!
The old boards, when you are done with them, decompose which makes it good for the world. They really provide charm and an "old deck" look and for newer condos in places like Toronto, provide great contrast.
Here's some other looks from this same page on Pinterest.