Since we have now birds and the attractiveness skill, I think it would only be logical to have more fur/feather colours like blue and green there are a lot of brownish birds, but there are also a lot of very colourful birds out there Blue Fur as a gene that gives +1 attractiveness (and maybe a debuff to camoflage?) and can be combined with yellow fur for green, red fur for purple etc. I'm thinking of a not-as-neon-as-toxic-body but still eye-catching color pallet While we are at it