This is how I made a large prop; A Woodland Tree
So they where bound together using a hot glue gun (see above picture)
Then paper mashe over the top with Newspaper
Then Tissue glued over the top of that to created a wood effect
Painted with brown acrylic paint
Then varnish to preserve this structure
Please note that even though this has been varnished , it is not entirely waterproof so more suited for an indoor display.