Please offer a way to manage the color of a calendar or contacts from the web interface. Many applications which use CalDAV and CardDAV follow the color which is set server-side. Only a very few can also edit the color which is stored in the server. Especially CardDAV clients don't have means to set it on the server. Implementing this feature will make it easy to centrally manage calendar and contact colors, which will be used by clients so that users can more easily distinguish between calendars and contact lists. Also users will get the colors they really want and don't have set colors manually in each client, often using a color pickers with either preset colors of which none are exactly the user would like to use. In case of color pickers which support all colors, the users usually cannot reproduce the exact color.