They are metal posts with designs welded to them. I also bought them at the DT they were right next to the hanging baskets. It was purely an impulse buy!!! I have used a variety of things for stakes... arrows, filing cabnet folder organizers, chopsticks taped together. most of the time i just go out into the woods and find some straight sticks.
I have never started a clone out under the hat and let it grow into it.... that would work though. I normally just give it to the plants i feel are worthy of wearing it, like you said. A flat screen on top would probably work better for a more complete scrog... below is a photo that Grumpy Old Dreamer grew. I want to try this sometime soon.
and I agree, one big plant beats out four small ones anyday.... unless you like variety.
With my new LED's running, I am at about 280 total including both cabinets!!! I think my PC uses more power!!! hahahaha
I did not grow this.... it was grumpy old dreamers plant that he posted on my thread in another forum