Tes has never had a good version of the "Druid" from d&d. Dragon age did a bit with the nature magic, but you will have to kind of crowbar your own not quite Druid into Skyrim.
Other then the shapechanging abilities (and you can kind of get that from werewolf) it wouldn't be that hard to pull it off. Hell there are even Scimitars in skyrim, which is the classic druid weapon.
http://www.rocketllama.com/blog-it/wp-content/uploads/2009/12/druid-20071202-031538.jpg
Wood Elf plus shouts give you an animal companion, plus you can buy a warhound (okay I admit I'm stretching).
Might make this my next build after I get my spellshield to level 50.