Today I posted another of my own materials which is a nice old red brick material. What makes it look good is not the image, but rather the bump mapping. It isn't to noticeable in this image:
but can really be seen in this one:
This image looks really good and it only uses one image, which is then run through some other nodes to get a nice looking black and white image to use for the bump. Another key piece in this image is the lighting, this is especially needed when using normal based maps, not actual geometry bumps.