While at my daughter's home in Grand Cayman, I spotted some fallen flower stalks from her Christmas Palm. The red berries had dropped off and the bare stalks seemed very flexible and sturdy. I brought some home to try for tree armatures. Results in a a different (for my layout) appearing tree. They could also be useful to cover thinly with polyfiber and flock.
Here is a link to pictures of Christmas Palms with berries and flower stalks visible, just in case you are in the climate zone where these grow:
https://www.dreamstime.com/chr...-tree-image358188242
Bob