You want a nature theme, but not animal summoning, elemental, or weather control. Have I got that right?
So what do you want? Could you give us an example of what you want to see?
I had a similar idea, but not as a primary:
Staff of Power
Blaster Secondary
Lots of self-buffs, a melee smash, maybe an invisibility power? The staff can look like any of the Staff Fighting options, of course.