How would you go about creating a 'Universal Primitive', a 3D primitive that could morph into ANY other 3D primitive?

This link is to a thread in the modelling forum - it will show you how far I've gotten in my quest (MO-72 Project)...

http://www.renderosity.com/messages.ez?ForumID=12402&Form.ShowMessage=1702723&Reply=1707923#21

This other link shows a bathtub made from a 'morphed' cylinder - an earlier attempt using a lower-poly count model...

http://www.renderosity.com/messages.ez?ForumID=12402&Form.ShowMessage=1702723&Reply=1707923#20

Thoughts are welcome (I know I'd have to increase the poly count to get decent Icosahedrons, Dodecahedrons, etc)...