I have now added a little paint to the base. I have tried to keep the base colours fairly restricted so that the base will not distract too much from the beast. Having said all that I had a bit of fun shading each of the blocks in the wall to try and make it quite natural looking.
I have tried to keep the metal work as painted black with areas of rust coming through.
Now all I need to do is add a little colour to the terrorgheist!