User blog comment:FastLizard4/New Skin and AJAX RC/@comment-49212-20100109171340

Or, like I said, give all templates a common class and format (or, say, one class/format for infoboxes, etc.), then the other skins can stay nice and light, it means much less work, and it makes it much easier for users to customise every template to their liking if they don't like what you put in mediawiki:monobook.css.

I don't think the other Monaco skins can be customised at all, anyway, can they? I know there's mediawiki:common.css, but then the selections in preferences would be wrong as they'd all be the same.