Ask HN: Best place to find creative talent?

I've gotten pretty good at finding awesome developers on Stack Overflow, Github, and even oDesk, among other places. I'm a developer myself so this hasn't been too hard. But I'm now looking for a creative person who can take our mobile ad campaign in a fresh direction. In the past I've used craigslist with mixed success but that was a few years ago. Is there anything better out there for creative talent that fellow HNers have used? Thanks.