Whatever you want. Parkour is about finding your own path, so find it, man. I personally don't use my time to make stuff for parkour. For me, parkour is everywhere. There's a tree in my backyard that I try stuff on all the time, and a park down the street that I practice on at night. I think you need to open your eyes a little wider and look all around you. There are so many obsticles in life around you, why try to make more?
But hey, I'm not trying to criticize, lol. That's just what I think and those are my methods. Never do something just because they tell you or they think they know more.