Here's what you need:
Wire (an old coat hanger works well for this) bent into a circle
Tree/bush cuttings (the longer and thinner the better). I used trimmings from a gigantic neighborhood ficus. Again, freeeeee!
If your branch is forked at all, just weave them one at a time. Pick one fork, and weave it until you get to the end, then go back and do the branched pieces. Be careful to wrap under leaves as long as you can.