Creating a transmog for a druid gives me the most fun out of all the classes.
You can choose the traditional green transmog. Take inspiration from the four seasons or space and stars. Play with the concept of a corrupted/evil druid with Emerald nightmare, drust or Ardenweald. Focus entirely on animal aesthetics for Guardian and Talon. Recently even dressed up as a flame druid. I once even saw a great transmog inspired by the element of water/Neptulon. My own persoal goal has always been to create perfect Astrologer transmog for Balance. The Archmage of Elune, can say.
my characters have different transmog, mounts and battle pets following them according to the spec.
my male druid is generally not very covered (and without shoulder pieces: i hate huge shoulder pieces with a passion) and its clothes have to do with leaves and branches. if i played feral i would add pelts and fangs. the mounts are either the instant transformation or some elite version of a nightsaber, dropped or looted here and there. i made sure to throw in at one piece of nelf heritage armor (on the head, specifically) as long as it made sense with the rest of the outfit.
I made a neat ensemble of shortskin pants, X shaped bandolier chestpiece and Deer brown skull with Highmountain dual-totem back item, on my tattooed Mulgore-born blackish male Tauren. Add a huge club for 2h and thats my take for ‘Barbarian Druid’.
Most important is usually to match the transmogg with the shape shifts but also Iam a big fan of heavy armored druids.
Either having a plate like armor like my current or one of the bark armors like the ruthless pvp one from cata.
Since druids can shapeshift no matter their armor, being heavily armored doesnt slow them down as they will only be out of form when stationary healing, and its better to be protected while you arent moving or you may get a axe / arrow to your back.
Went with an outfit that matches the character name for this one. At the time it was the only acceptable race for a druid alliance-side, and I went with black since that’s the worgenest worgen to me. Picked a name that sounded like it would fit both the appearance and class, which surprisingly wasn’t taken.
For my Zandalari I’ve gone for a more minimalistic outfit, mostly the heritage set but with the red warfront (and now also trading post) cloak, the tier 1 shoulders which is the most druid-looking thing in the game imo, and no hat.