on one hand i think it'd be pretty neat to get some customization but on the other i think there's benefit to there being a unifying look to the sites overall look.
Something like adding a banner and being able to pin posts would be nice. If we took it a few steps more maybe something like deviantart's widgets would be nice. I'm not to sure how far I'd want to take customization or would be able to but it's an interesting idea to entertain.