Custom Game Colors
There are a few hidden colors beyond the 40 player colors. These colors cannot be obtained by a player due to the 40 player limit, but these colors do appear when assigning territories to slots AO through AW in Custom Game.

#B0BF1A Acid Green
#3B7A57 Amazon
#4B5320 Army Green
#664C28 Donkey Brown
#893F45 Cordovan
#36454F Charcoal
#FF00FF Fuchsia
#76FF7A Screamin' Green

if those goes on premium price, it will be like unique, ones you buy that color no one can buy it 2nd time