Take the above image for instance. The dirt and grime really add to the image. Another one of my favorite things to do is to take pictures of something very clean and shiny in front of something completely the opposite.
The contrast of the shiny black car and the dirty, rusty pipes really make the image. Experiment with things like this next time you are out shooting! Here is one more example how patterns as well as rust can really add to an image. I found these rusty augers in a local farming community. They really made for an interesting image!
Keep an eye out for things like this next time your shooting. Things like this are all around and can provide for some very interesting images.