It seems that one polymorph spell has been left out of Pathfinder so far — polymorph any object. How about this?
POLYMORPH ANY OBJECT
School transmutation (polymorph); Level Wiz/Sor 8
Casting Time 1 standard action
Components V,S,M (piece of creature or piece of object material)
Range Close (25 ft. + 5 ft./2 levels)
Target One creature, or one nonmagical object of up to 100 cu. ft./level
Duration see text
Saving Throw Fortitude negates (object); Spell Resistance yes (object)
This spell functions as greater polymorph, except that it can also be used to transform a creature into an object, an object into a creature, or an object into another object.
An object used as a target or result of this spell must be solid and continuous, though a target object may be part of a larger object, such as a section of a wall.
An object transformed into a creature has the stats of an average member of the creature's species, though its special abilities are still limited as per greater polymorph.
This spell cannot transform a target into a substance of great intrinsic value, such as precious metals or gems, nor can it transform a target into cold iron. This spell cannot transform a target into a magic item, nor can a magic item be a target.
Transforming a creature into a creature or an object into a creature has a duration of 1 min/level. Transforming a creature into an object has a duration of permanent. Transforming an object into an object has a duration of permanent (but see below.)
This spell can be used to duplicate the effects of baleful polymorph, flesh to stone, stone to flesh, transmute mud to rock, transmute metal to wood, or transmute rock to mud. If used in this manner, it has the same duration as the duplicated spell.
This spell can also be used to duplicate the effects of fabricate, but with a volume limit of 100 cu. ft./level (or 10 cu. ft./level for minerals.) Since this use merely reshapes the material, it can be used on valuable materials. The spell still takes only 1 standard action to cast, but its duration for this use is instantaneous.