For me it's more like.

Say I have an idea for like a noir type setting or something. I night want to go more jazzy sexy or I could go the opposite and go like gritty dingy *drool* Brody Dalle from the Distillers....

But each would put me in a different mood for what I'm doing right? Like I jazzy I might think more mysterious and lynchy where as drain the blood, i'd probably go more sin city