I have a "what I did" about making background trees with lichen and Woodland Scenics Foliage at:
http://www.pacificcoastairlinerr.com/4x8/backdrop_foliage/
Thank you if you visitHarold
Good on you, Harold. They work well
Mike
Modelling the UK in 00, and New England - MEC, B&M, D&H and Guilford - in H0