This should have been done using one of my drawings but as I recently became addicted to Pinterest I couldn't resist using a picture I saw and found so inspiring.
I used different yarns - wool and polyester - and also wool for felting, the fabric is linen. The more uncommon material was the window rubber insulation strip. I was surprised to see how well it worked, it made a soft an voluminous tree trunk where I could easily embroider the moss. The felting wool was used for volume and the wool yarn to create the leaves' texture.
Photo from Robert Friel