There is not much to offer for the .com WordPress users. Seems there should a variety of themes for new users that are easy to understand, but not to the point of being boring. Not all users are techie gifted and some have trouble understanding the new editor so I can't imagine them attempting to build their own theme. A theme that functions well, has all colors available even for backgrounds, and for some a sidebar can be simplistic, but has enough bells and whistles to spark one's creativity. IMO, an attractive theme is an excellent lure for newbies so they can easily showcase their work.