I've started on a "wild barbarian," which loses rage but gains wild shape. I think it could probably benefit from some of the rage powers (or modded versions of them). Suggestions for balancing when wild shape is gained and any other additions are welcome.
Wild Barbarian
While most barbarians gain battle prowess from their fury, wild barbarians shapeshift into deadly beasts to slay their foes. A wild barbarian has the following class features.
Weapon Proficiency: Wild barbarians are proficient with all natural attacks (claw, bite, and so forth) of any form they assume with wild shape (see below).
Wild Shape (Su): A wild barbarian gains the ability to turn himself into any Small or Medium animal and back again once per day. His options for new forms include all creatures with the animal type. This ability functions like the beast shape I spell, except as noted here. The effect lasts for 1 hour per barbarian level, or until he changes back. Changing form (to animal or back) is a standard action and doesn't provoke an attack of opportunity. The wild barbarian must choose a single animal form for each size. Once chosen, it is permanent.
A wild barbarian loses his ability to speak while in animal form because he is limited to the sounds that a normal, untrained animal can make, but he can communicate normally with other animals of the same general grouping as his new form. (The normal sound a wild parrot makes is a squawk, so changing to this form does not permit speech.)
A wild barbarian can use this ability an additional time per day at 3rd level and every two levels thereafter, for a total of ten times at 19th level. At 20th level, a wild barbarian can use wild shape at will. As a wild barbarian gains levels, this ability allows the wild barbarian to take on the form of larger and smaller animals. Each form expends one daily use of this ability, regardless of the form taken.
At 4th level, a wild barbarian can also use wild shape to change into a Large or Tiny animal. A wild barbarian's wild shape now functions as beast shape II.
At 7th level, a wild barbarian can also use wild shape to change into a Huge or Diminutive animal. A wild barbarian's wild shape now functions as beast shape III.
At 10th level, a wild barbarian’s wild shape now functions as beast shape IV.
This ability replaces rage, greater rage, tireless rage, and mighty rage.