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wow, those were some kewl website.
But I was just thinking, if you take a look at myspace,livejournal (and similar community\blog websites), they dont really have catchy themes\designs. However, they have given the authority to users so that they can customize pages.
I was working on a similar concept, and trying to come up with a theme (based on phpizabi design) for xoops.
You can have a look at it
here, this is the default css.
Take a look at
here here and
here, these are customized users' profile.