Start with a section of chicken wire (these come in rolls of various lengths and widths) and cut a straight line across, and form into a cylinder. Where the seam up the back joins, you will have to twist the ends to secure each little opening. Below photos show the way I cut and twisted the ends to minimize sharp points.
Now comes the fun part!
Start scrunching the wire into whatever shape you are trying to achieve....mine never come out the same. (You will know you are done when your hands are cramped, and your manicure in shreds!)
Spray paint the color you want---I combine black, rust and brown to get a rusty, vintage look.
These take about 4 hours from start to finish.