Watch face customization tutorial video
I lead you through the complete process of designing a custom layout with a custom clock bubble
Jump to parts by clicking on the time-codes below:
0:15 (Adding an App Bubble Cloud home screen widget)
1:32 Working with the Wear Bubble Cloud Editor
2:30 The Layout Designer
5:07 Assigning Live Info to bubbles: weather, date, battery
5:43 Changing bubble colors and behaviour (e.g. Wifi hotspot)
6:16 Clock bubble customization (colors + design)
7:01 Swap tool to easily exchange bubbles
7:48 Publishing the layout coordinates string

Other videos:
Bubble Cloud product video: https://youtu.be/Daa2hsanBhY
Watch settings in-depth: https://youtu.be/5POinD9natg