In the past, I've made hoops from PVC just by sticking them in the ground or over rebar and arching them -- pretty easy to do in the hotter seasons. After a while, they take on the arched shape and won't spring back.
A couple of years ago, I started securing these pre-arched hoops on top of T fence posts to make trellis support with zip ties for pole beans that got out of hand, raised support for plastic sheeting to keep a banana plant out a little longer in the fall.... But the plastic hoop can be flimsy in strong winds for supporting plastic. So I asked my BIL to get me some metal conduit pipes.
I've been eyeing the bender kit sold by Johnny's since I'm often perusing their catalog and website, but I couldn't afford it, really.
So I was looking around the garden thinking about this, and what that kit does to make good hoops... and all of a sudden my eyes saw this pile of rocks, which my DD and I randomly placed here after acquiring them. They had settled into the ground over the last couple of winters, so I will need to lift them out and move them over to the pond when I'm ready for the bigger rocks, but -see- there is a gap between two rocks that would hold one end securely, and then the biggest rounded rock would be perfect for bending the metal conduit on... Wouldn't it?
...so I tried out my idea