I don't have anything made up (sorry) but just thinking out loud...
I've often thought the base druid seems/seemed to be a little too much concerned with the animal or plant-side of things (summoning, control, including the shapeshifting) and, though it was in the spell lists, not enough concerned with the elemental...element, of nature.
How about a prestige class, starting at 6th or 7th level, of an Elementalist Druid?
You could make 4 different ones and break it up into earth, air, fire, water...or (personally, I'd do) 5: earth, air, fire, water, weather (kinda an air/water combo)...or just ball it all into one, since really with druids being concerned with "the Great Balance" probably wouldn't pick/focus on one or the other (assuming you use this sort of flavor with your druids). Liiiike... Intiate of the Holy Cauldron or Chalice (in which all 4 elements are joined together) or something like that.
Or you could follow modern-day pagan symbolism/understanding of druidism and make a prestige class like, "Ivy Knight", "Oak Speaker", "Stag Prince." Basically, just keep all of the base powers and throw in some extra as concerns...for the examples I just gave: Ivy Knight: winter/cold; Oak Speaker: communing/divinations; Stag Prince: animal speaking/summoning and/or transformation.
I could probably come up with some more...gimme a minute.

--Steel Dragons