Up against the wall:
Creating realistic brick patterns in POV-Ray.
How to create walls and other objects using randomly-colored bricks, without having to create hundreds or thousands of individual brick objects.
Understanding the POV-Ray matrix keyword
Not only can the matrix transformation perform the same function as the scale, translate and rotate keywords, it can also be used to skew or slant objects.
Understanding Blobs in POV-Ray
How to make blobs do what you want them to! Learn the relationships between the blob threshold, component strength and component radius.