"My personal great idea was always a set of ecto/meso/endomorph bodies and exchangeable heads, but alas the world is not ready for such genius"

 

Example 1:

http://www.renderosity.com/mod/bcs/satoko/40793

Satoko was an anime head that fit on V3, V2, PTVic, Laura, etc.

Example 2:

http://www.runtimedna.com/Melody-2.0.html

"All the charm and warmth of the original Melody can be found here in her newest incarnation, with one large upgrade, she is a parented head instead of a full figure."

 

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For strictly (more-or-less realistic) humans, a morph is simply more convenient as long as the mesh geometry is able to contain the new shape, but if you need radically different head shapes on a variety of bodys, the parented or alternate geometry head still has its advantages.

 

:-)