Player Sheen could be a later level unlock to represent a players dedication to playing. This idea comes from precustomization Player skinning via Modding. People used to Edit the Mat Layer and by adding a color instead of black/white/green it would create this sheen effect. I think this would add a nice look to those who have dedicated to playing! It could be a sign of "Those that know what they are doing" for others. In the attached Image, you can see the Purple Sheen.