Grunge Poster Techniques

I really enjoy seeing grunge posters like the following, but it is always a delicate balance between making it look.."dirty" vs simply trashy following are a few examples.

Some of those are better than others but the concept remains the same. Take fairly clean and simple images(mostly vectors) and combine it with a paperish colored background to make a fairly unique poster. I'm also going to take this time to touch up my skills with the pen tool, and most likely combine the pen and the brush tools. Some filters will be used from the looks of it as well. Results/proof of concept will follow shortly.