I love textures. The best way to express textures is to shoot in black and white. Now, admittedly, this photograph was originally taken in colour as it was a digital capture, but my intent was to turn it into a black and white photograph featuring the scuffed paint.
Depending on the luminosity of the object (how much light it is reflecting), it will appear lighter or darker in a black and white image. We can take this further by applying a colour filter so that only certain colours of light can pass through. For example, using a blue filter will cause objects that are shaded blue to appear lighter than colours that are shaded in a different colour. That is, using a blue filter on the sky will cause the whole sky to light up since it is primarily blue. Using the same blue filter on a person will cause them to appear much darker than desired as skin does not have a lot of blue in it. Now this sort of thing is a good thing so that one can achieve good contrast to feature textures.
Photoshop does a similar thing by tweaking the red, green, and blue values of each pixel so that the calculation to convert the image to grayscale favours a certain colour over another. In this case, I did not actually use a filter. I achieved enough contrast to satisfy my needs.
Taken with Canon EOS Digital Rebel XTi.
Canon EF 50mm f/1.8 II.
Shutter Speed: 1/500s.
Edited with Adobe Photoshop CS4.