I use limbs from a tree in my front yard that work great. I just hose them down and let them dry. You don't want to use any that are sappy or toxic. Other members have used soaker lawn hoses as highways and vines.
Fake vines are fall apart. Go to Hobby Lobby or Michaels and buy the largest grape vine wreath they have. Carefully take it apart and you have all the vines you need of varying diameters. They last forever! Just wash them 1st.
coated Electrical wire - the kind you wire your house with and similar. Comes in all sorts of colours and thicknesses, any length you want, easy to clean, bend.
Cool.. i just got 2 6 foot biovines 1" and 1/2" packs.. good thing about vine is that you only really need it on the top 25% of the cage.. so you could go in a circle almost like a spiral staircase hitting all sides of the top of the cage and across. I have a 2/2/4foot cage and that is what i am doing with the vine. i'll post pics when i set the whole thing up...