Few grunge banners, you can use em as a background for your text and graphics.
Grunge is a nasty and sometimes ugly style in design, but it is a popular trend. Even few elements of grunge style can elevate an idea of your design. Most often used details in this abominable visualisation are: half-tone, splashes, drops, rasty spray. Vector images can be opened in different computer art programs, for example: Corel Draw, PMView, Ventua Publisher, Xara, Flash, and of course Any Adobe Software Photoshop, Illustrator, Indesign etc. can be used to open and edit vectors. Illustrator CS3 my certain decision!