The existing styles are enough as it is. There's no way in hell I'm going to encourage more styles just to satisfy a few people's tastes - I think the general three we have are fine. We only had one for years and nobody really complained that much. The more we do for people who want to mix and match, the more people are going to ask for more. The last thing I want is for this place to become more like Fool's Gold, where some people might say they had more styles than they have brains. There are actually 12 styles right now, most of them just aren't selectable (and only about two or three of those were actually completed for use, I think).
I am however starting to work on the idea clout and I discussed in the past of an extremely simplified style that is entirely image-less etc, but it might take a while to get sorted out, and it will not use the black and blue but rather be (probably) white and black. It'll probably take some time, though. The main aim of it is to be friendly for both work environments (ie mine, I don't like having my boss always see a black and blue site, it's way too obvious it's not for work :p) and for 56k users.