I've found a great-looking and practical theme that I think would work well with WordPress.com.
Here are the details:
Theme Name: Hueman
I would love to have it on WordPress.com because it's not like any of the current themes and looks great on some of my favorite self-hosted WordPress blogs. It's a responsive theme and is very good when it comes to widgets and other customization options. This must be why it's very popular with web-designers and owners.
I hope that you read this suggestion and contact its developer to move things forward.