My wargaming partner painstakingly carved a number of masters out of wax for these walls and from these we created moulds. The walls are then cast using plaster and painted with a number of acrylic colours before the bases are flocked. I'm practicing taking photographs with my girlfriend's camera as my camera has finally given up. The photo above is a little bleached in colour, the walls are a little warmer, but gives a reasonable impression of the finish.
The hedges are simply made from kitchen scouring pads and flocked and stuck on card bases. Wargaming structures do have to be more robust than those seen on a railway layout as they are constantly handled. Which does make me think that this is not the total method I will be using for hedges on the layout but I may use something like this as a base for hedging.
More can be seen at http://miterritorials.co.uk/