The grunge style is one of the most commonly used today. It is usually seen in many places, either in strong tones and well-marked, or with warm colors and styles here, but in milder form. The issue is that in one way or another it is likely that at any moment we will have a design style, and for this we must be prepared to do so, as in the issue of having adequate resources, both textures , brushes, icons, etc..

SpoonGraphics published an excellent collection with grunge style Photoshop brushes, all in good resolution, ideal for quiet work, and offering a variety of formats. Remember depending on the project they have in mind, check to see if the licenses are to be used for commercial purposes.