2 basic watch faces showcasing what can be done using sensor.

You can find a Gist showing how to use the accelerometer to produce the same effect here:

https://gist.github.com/degliwe/cb115278fbb62065e76e

If you are interested by the theming selector you can find a Gist about how it is done here:

https://gist.github.com/degliwe/47ca967d0041cffade12

/!\ this is a sample intended for developers, if you want to use these faces, feel free to do it, but they come as is without any support.