For those who have the custom design upgrade enabled on WordPress.com, it would be neat if we offered a bare, stripped to the basics page template you could style to your hearts delight. For instance, if I do a year in review post, it might be nice to prepare a unique design for that. Dustin Curtis is notable for producing custom layouts for each post.
Obviously you can do this now, but you first need to reset a lot of design first. If you switch themes, there’s no guarantee your resets will still work.