[Gold & Appel Inc]

Orions in my group's Star Trek game are pretty much physically-attractive green humans as far as physical stats go; the differences are cultural. They are the one group in the game that the GM has declared politically neutral (ie: neither a stated ally or enemy) to the Federation, but they're still a huge anti-authoritarian pain in the ass in places where we're the authorities, so dealing with them is a frequent but mixed proposition and we've been both allies and adversaries in various scenarios depending on our goals and can never quite know what to expect from them.

IMHO using a group like this enhances the game quite a lot, but whether you want the Orions to be that group or not is a matter of taste.