I started to make a tree for one of my projects. So far, I have finished the skeleton. I wanted to share this method, as I am pretty much making it up as I go.
I used a wire hanger, masking tape and wire. I shaped the hanger into a trunk and roots. I wrapped it in masking tape. Then, I took wire, cut lengths, taped them to the wire the trunk and covered those in tape. Lather, rinse, repeat. :)
This is the result:
A closeup, you can see the masking tape. I added secondary branches with the same method.
Here's an idea of scale: it's next to my herb shop and my Alison.
Next steps include: covering it with paperclay, painting it, finding/making leaves, and attaching those leaves.