The Calendar component can be fully styled using CSS.

CSS theme structure:

CSS Themes

See CSS Themes. 

You can find the sample themes in the demo/themes directory in the DayPilot package.

CSS Theme Designer

You can also create your own CSS theme using the online WYSIWYG theme designer.

Availability

Availability of this feature in DayPilot editions:

LitePro
DayPilot for JavaScriptFull SupportFull Support
DayPilot for ASP.NET WebFormsFull SupportFull Support
DayPilot for ASP.NET MVCFull SupportFull Support
DayPilot for JavaFull SupportFull Support