Base start of a "random species" tree. I took a medium size branch as the base of the tree, then I added other smaller branches to built the tree as I wish.
Second and biggest tree. This is the result after adsong the seafoam. I cuted the branches so I could pierce a small hole and then add the seafoam. I placed the seafoam by the size of the branches to make the tree the more natural possible.
I used a simple branch from a bush of my backward. The branches have a soft almoat hollow center, so it is easy to carve and pierce to add the seafoam.