These are my very first attempt on making frames and tree, material used are everything i have in house, wire for the trunk and steel wool (for dish washing) for wrapping the wire and for the branches. The steel wool is so curly and kinda hard to make them shaped properly. Not recommend it but those all i got for now. i cover the frame, as suggested, with diluted white wood glue and saw dust with a little drop of dish detergent. after it get dry i dip the frame into latex wall paint. And finishing with acrylic paint.
I try to make the leave on one of my frame, it's made of fiber you use for washing dishes, i cut it into very small pieces and pour it with tea sieve onto the glue-sprayed branches, but it seems not quite succeed. The volume seems not right and the color is not as green as leaves.
The tree frames in the picture are on my first diorama ground, made of used carton, the top of shoe box, some toilet paper, white glue, and for the dirt i use saw dust. Later there will be grass on those dirt (when i know how to make grass
)
And, yes, please be kind to give me advice