In fRO I see a lack of diversity in character customization.
I suggest that there is a NPC that will take 2 emps, combine them, meaning the colors are for example, half white half black, and when you get a multi colored emp, there is an added bonus of +5 stats. Any emps can be combined.
The coloring could be one side half black one side half white, or every other zodiac letter is switches off from black to white.
I think that this would add to players looking a bit more different than others.