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Customization = good, but I think you picked a bad example. The themes are functional. hubski is essentially a forum, and I've never been on a forum that benefited from too much thought about its skins. (See: livejournal.) I've spent time on a thousand forums, and basically every time I tried some skins and defaulted to basic out of sheer necessity. What other kind of customization do you want? Usage changes? Specific UI stuff? I think I'm stuck in the reddit mindset where I can't see a reason for everyone's hubski to be slightly different.