Having a smili just to pretend it's a pet isn't that bad Applefiend, that's what I do with my Tali^^.
There are two types of natural smili colour. The first range is the brown kind from red to yellow through any kind of orange and brown, and the second is the grey type in a slim spectrum of blue, moving towards a slight tint of purple. I do make quite some unnatural and unuual designs for them, but I'll stay in my colour range. It's my "comfort zone"

There won't be a green one, sorry. It's extreamly hard to make a green mammal look possible... It works with birds, fish, reptilians, amphibians and insect. Acctually, it works with just about any other animal. The only green mammal I know about is the sloth, but that is because it has alge growing in it's fur.