The Volus! Good google moogly I've had these designs since like 2013? I thought I'd upload them as I'm re-playing the mass effect series and been doing new doodles including Volus clothing and what not.
You can see some concepts here:

http://www.furaffinity.net/view/19837849/

This is sort of a semi-finalised concept. Non offensive idea down just to get a feel mainly for the faces and how it would work with a body. This is sort of a 'safe' option that adds uniqueness but doesn't clash with the world bioware built.

I plan to do more interesting concepts later including clothing. I may do a more unique version of the face and body going with ideas of what I'd think would be more interesting whilst making it work with their body suits. But I rather like these guys as they are. I've added a female option but we've never seen a female volus in-game so it may be the genders wouldn't be very different at all. Maybe they don't have genders like we do as they are so rarely referenced. We only ever see male sounding Volus so it wouldn't be a stretch to imagine they are something akin to hermaphrodites.

I'll upload my first draft concept later and hopefully more ideas to come!