My other options for druid conversion are:
- Fey pact Warlock with Warlord training, Combat Veteran paragon path
- Fey pact Warlock with Cleric training, Divine Oracle paragon path
- Protecting Paladin with Wizard training (heavy power swapping), Spellstorm Mage paragon path
A Paladin with the right powers may be a surprisingly fitting base class for "avenging" druids (although the "avenging paladin" build option is not so much for them, I guess). Also remember that with Channel Divinity, they can take deity-specific powers, and become "nature paladins" very easily. Ok, there are not many good ones, but it's a matter of flavor.
Star pact Warlocks can, surprisingly enough, fit some druids better than Fey ones... The dark feeling is good, and their powers are easy to re-flavor if needed.
The Radiant Servant Cleric paragon path may also fit many.
The options are many.
Oh, and no limitations on weapons and armor if you don't wish so
P.S. Speaking of Wizard, a wacky (and somewhat out of the rules) build that came to mind was having a Wizard with high Con, Fighter training and the Iron Vanguard paragon path: choose many spells that push enemies or knock them prone, and apply the Con modifier to damage of those powers... I know it was surely intended to be with melee attacks (although not specified at all), but one could easily say that this kind of "druid" is able to channel his natural/physical prowess into his supernatural powers... I don't know why, but it feels very druidic (and powerful) to me. Besides this 16th level feature, you actually become a much more resilient wizard, thus becoming closer to a druid. With the Enduring Warrior feature and good area of effect powers, you could regain MANY hit points as you kill many enemies at a time. You only miss the ability to heal others...
