Horde Groupware theme for Core, Kronolith, and Imp.

The following themes are available. 

- KntHost-Blue
- KntHost-Green
- KntHost-Navy
- KntHost-Purple
- KntHost-Red
- KntHost-Turquoise
- KntHost-charcoal

See https://www.knthost.com/horde/horde-webmail-theme

