Good Design is is as little design as possible
I have worn this watchface design the whole day on the Moto 360 and it is just beautiful! Thanks the photographer and artist vanboosh. Check out his website to see some really cool artworks.
Download simplism by vanbooshh
Update As some user of the Moto 360 argued about the flat tire thing, here is a design adapted to this.
Download simplism by vanboosh for Moto 360
HOW-TO ASSIGN WATCH FACE
Simply import the zip in the WearFaces App.