From Official Kodi Wiki
Change Kodi's GUI from top to bottom and add all sorts of customizable options by discovering new interface skins. Learn about the ones available, or even how to make your own.
1.1 General topics
- Estuary - default skin for Kodi version 17 and above.
- Confluence - default skin for Kodi version 16 and below.
- Comparison of skin features
- Skin screenshots