Byrdie! The first two that come to mind are: The desert world: Dune, Frank Herbert Ewoks: Poul Anderson's Hokas (See "Earthman's Burden" and "Hoka" - great books). But there are are a ton of others. Lucas' great acheivement was taking them all, changing them enough so HE didn't get into trouble on copyright, and making it all work together. Of course, it could be that he thought them all up on HIS OWN and I'm completly wrong! That can hold true for our work too.