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Before you start, find a good grunge/distress texture image big enough to cover your design. Once you have your image, convert it into black & white in Photoshop or Photoshop-like program. You will also want to adjust the Brightness/Contrast of the image—you don’t want too much gray in your image or else it’ll end up being a big halftone mess in the end. I like to turn the contrast up to 100 and the brightness between 20-40, depending on how much of the texture details I want to show.