About a month ago, Facer, a smartwatch customization platform, landed on the Apple Watch via a free of charge App Store app. Unlike most other apps for customizing watch faces, Facer puts your style and individuality on full display with thousands of custom watch faces and the ability to design your own with an online creator tool.
The app can pull watch face images from a variety of sources, including your Instagram feed, and it even has neat flash card style faces for learning things like languages, constellations, Solar System's planet names, the elements of the periodic table and so forth.