C#: automatic conversion from enum to class

Consider this scenario.

1. There is a struct Color (written by someone else)
2. There is enum ColorCode which implements html named color codes.
3. There's a static function that converts ColorCode to Color

4. I want to be able to do this:

   Color tmp = ....;
   tmp = ColorCode.Aqua;
   

How do I do this without copy-pasting text 140 times?

I don't really care what ColorCode is (enum, class, whatever) as long as the above line works.

Problem:

C# does not allow me to define operators for enums. I also do not have any macros to make some nice human-readable table within ColorCode.

Restriction:

Contents of ColorCode should be available as ints, but should be assignable/ convertible to Color.

Code fragments:

public enum ColorCode{
    AliceBlue = 0xF0F8FF,
    AntiqueWhite = 0xFAEBD7,
    Aqua = 0x00FFFF,
    Aquamarine = 0x7FFFD4,
    Azure = 0xF0FFFF,  ///Repeat 140 times
    ...
}

public static Color colorFromCode(ColorCode code){
 ....
}