There are several ways to create Urban Style artwork .. You can make it from Scratch like in this Tutorial that I posted.. Or you can ease you work by using versatile Vector brushes..
Photoshop user are well aware of Urban/grungy style artwork.. But like my previous Tutorial I will use my favourite GFX program I.e. THE GIMP to create Urban Style Artwork..
Source: http://www.fsdaily.com/EndUser/Tutorial_Create_Urban_Style_Artwork_Wallpaper_using_Gimp
After seeing few glassy logo box and buttons. I thought of making the same using Gimp.. I searched for Tutorials for Gimp ,but all in vain.. while users from PS can find a bunch of 'em. Actually it was PS tutorial from where I got the idea of creating Glassy Logo Box..
Source: http://www.fsdaily.com/Beginner/Tutorial_Create_Glassy_Buttons_with_Gimp