ASP.NET Color Picker - Custom style file

You can create your own CSS file - see Working example and /ColorPicker/blueStyle/Style.css file in downloaded Suite. Also you can redefine some predefined CSS classes - see Working example.
The following picture shows all classes used in CSS file.

When Color Picker has child control(s)

<obout:ColorPicker runat="server" ... >
  Click to the box:
  <asp:TextBox runat="server" ... />