One of the frequent posters on the Office 365 Grid community Matt Hughes, has posted a free Master Page template for Sharepoint online… sharpening up the experience with a Metro overhaul. Read more here : http://community.office365.com/en-us/blogs/the_grid/archive/2012/06/29/free-sharepoint-office-365-master-page-amp-css-grid-user-post.aspx

This could be the first in many free templates to update the existing Sharepoint Online experience to the new world of Metro sharpness.