I would do something like:

Color named: #red.

Color named: #blue.

That idea crossed my mind (it would be good for serialization from some external data), but how would you as user/programmer know what to put in there?

The idea of enums is that you have a predetermined set of predetermined values, so this

Pros are that there is no endless lists of methods at class side

is actually a con, because the user doesn't know them.

Everyone knows red and blue, but nobody remembers to the letter domain-specific props (in fact half of the class-side colors you wouldn't guess you could use named).

BormParticipantRole class selectors "#(#Approves #Undefined #Performs #Initiates #IsResponsible #Acquires #Cooperates #IsInformed #Consults)"

BormParticipantType class selectors "#(#Organization #System #Person)"

But maybe Color was wrong example because the set can be very large (although the set of options is also limited if you consider some standards).