Personally I like the idea of a black and white faded backdrop picture with small colour pictures on top (as in the example I'm attaching). However, I'd be completely open to a very different visual style - but something eye catching, provoking, interesting that paints a global need of reaching forgotten peoples.
Imagery is hugely important - so I'd rather have a great picture that says a lot of things, than saying a lot of things with words.
Colours could be anything. We do have certain colours we're using on the website, but it might be nice to have something different, a bit more dramatic. I like the idea of an edginess, something that is more transcendent, perhaps provocative.
I love faces too, and probably faces of different cultures where the Gospel of Christ is not yet heard - Tribal, Hindu, Urban (secularist - unchurched), Moslem, Buddhist. But not nice smiley faces. They can be nice but a bit gritty, needy looking, drawing attention - you have to look.