Sounds like a good idea, I'd be more than willing to join in. Speaking of which, I'm really scraping the bottom of the barrel with this one, fell free to hate it. I'm also going to do a psionic version once I get the book back from my friend.

Mud Mail (subject to change)
Transmutation
Level:Drd 2, Rgr 2
Component:V, S, DF, M
Casting time: 1 standard action
Range: Touch
Duration: 10 min./level
Saving Throw: None
SR: Yes (harmless)

This spell draws surrounding mud up to cover the target in a protective shell, functioning as Barkskin except that the natural armor bonus is always one higher. Also, the target's armor is treated as one step heavier. If the target is already wearing heavy armor then their speed is reduced by an additional five feet.
Material Component: Mud