Heres a video made by Gerrit Kleyn Winkel, the developer of the Multi watch application for the Tizen Samsung Gear 2. The application has been submitted to the Samsung Apps Store for testing, and if successful will be available for you to purchase for an Introduction price of $1/€1 for early users.
The video shows two exciting developments:
You basically need to download the theme file from gearfaces (.wstheme), and copy it to the downloads folder on the Gear 2. Make sure you have USB Debugging enabled on the Gear 2 in order to copy the files across, Settings -> Gear Info -> Select USB Debugging.