You need a tube of expanding foam from Mitre 10, blob out a dozen squirts of foam in an oval shape, wait until dry and then get a knife and carve up to the desired shape (easy peasy indeed) and applying a layer of poly filler over, once dry its down to gluing some sand and loose stones about. Then its the fun part of painting and basing them up.
We also found another YouTube clip being Black Magic Craft channel here , about making forest trees from washing scouring pads and they look very good, so back down to Mitre 10 and got some 8mm wooden dowels , about 3 packs of heavy duty scouring pads from Pak&Sav .... then it was a simple matter of chopping them all up into oval shapes of different sizes and skewing them with the dowels, once all thats done you have to glue spray the flock on, paint the trunk and stick it into the expanding foam hill - done
Quite impressed with the results, and makes it quite a fun gaming table to play on - we had a game of bolt action the other day playing my 1942 Finns against Andys 1942 Romanian list he made (using his German figures) - I won that game (haha) Andy had some shocking dice and I couldn't fail a morale check (must of done 10 or so)
Righto, first up is some photos of the wooded cliffs