This post enlists free download of various vector grunge backgrounds. 
These vector backgrounds can be used to create stunningly beautiful
backgrounds or tiled textures for you websites, web interface, artworks,
poster works, and more.  Download the backgrounds and play around to
give a creative look for your wonderful graphic works. Cheers!
Download – Halftone Texture

Download – dccanim_grunge3

Download – 50 Free Vector Grunge Corners

Download – Gaycity Action Booklet Cover

Download – Grunge Splatter

Download – Grunge Splatter 2

Download – Grunge Edges

Download – Vector Splatter

Download – Urban Vector

Download – Vector Shape Grunge

Download – Car Grunge Background