You can make a frame that sits on the floor and rises up on 4 vertical members and finishes with horizontals at the top to tie it all together, out of PVC pipe and fittings. Then you can add horizontal members lower down that are adjustable for height. They can be lashed to the verticals w/ doubled up rubber bands or small bungee chords, and held at a certain height with hose clamps below on the verticals.
Kind of ghetto, too, but very flexible for size, shape and configuration. This is what I did once, and it worked pretty well, since I didn't want to hang from the ceiling.
I like PVC because it's easy to cut and work with and the elbows or tees can just be slip fit (not glued) for an application like this. Depending on the distance between supports, class 200 pipe is adequate.
Another option is chains hanging from hooks at the ceiling.