7of11 - Originally I did it to simulate moss etc. growing up the walls, but I know it's been kind of faded out by the blur effect. I suppose I should have lied and said I did it just to make the creature stand out more ;) I still prefer it to the standard wall colour, but it could do with a little more frequency. madmax - thanks for illuminating insight into the methods by which I might improve the image. Maybe you could become an art critic when you grow up.