metel tubing

floral wire would be great for the poseability. you should try to use the floral wire, fold them a few times over to get the size you want (girth wise) and then dip it in liquid rubber. it will give you a very tight skin over the wire that you could paint and it will be able to be posed any way you want it it. I use it to make webbing for venom and spiderman, works amazingly well and it's fairly cheap. The wire shouldn't be more than a few bucks at a craft store and the liquid rubber should only be like $6 or so and you get enough material out of them to make a lot. If you want some examples, hit me up in a pm and I'll show you the webbing I've made.

try getting some lego hoses from those technic sets they have all sorts of tubes and hoses in them

Unless you need clear tubing....then try aquarium pump tubing. Again cheap and at most stores (in the pet department,by fish supplies)

You can try floral wire. It is wire coated in foam rubber. It is easily painted, and can be purchase from any(craft section, near the fake flowers) department store for cheap. It is flexible and easy to use with most figs and glues. You can cut it to any length you need too.

CAboose