For a couple of Shadowrun sessions coming up, I'm going to be playing an NPC from the Mile-High City. She's an inexperienced ork fixer, low-class background, brought up among shadowrunners. I want to give her a different "feel" from my regular Philly-born fixer character, so I'd like to try to figure out an accent. I don't have too much practice with NPC voices, though.
Advice and examples would be helpful; soundbites would be ideal. A little bit of historical context wouldn't hurt, either.
Edit: Per @OpaCitizen's suggestion, I posed this question on english.se, and got a pretty detailed answer, that also covers accents for other regions: