In my game, I conceive of druids as individuals who live on the fringe of society who commune with "small gods" such as fey and other nature spirits (in contrast to clerics, who deal with the "big gods"). Like Rangers, whom they are often akin to, they act as mediators between civilization and the wilderness; members of both, but not completely on either side. They care about the natural (primeval) world, so more "civilized" people might regard them as troublesome weirdos.
They may have loose societies or conclaves, but generally they are solitary individuals following non-dogmatic traditions, so there's plenty of room for uniqueness.
San from Princess Mononoke, if she could transform into a wolf, is a decent reference point to me, as well as Gloranthan shamans.