Update: Looks like Google let the developer restore 4.4 support to the existing app. So...you can have Facer again.
When it comes to rolling your own watchfaces, few apps do it better than Facer. It's crazy-customizable, feature rich, and easy to use. I figure at this point most hardcore Wear users are sporting it (or have at least tried it out), and today it's getting a pretty significant update.