I have yet to develop a consistent approach to the depiction of a single individual. Most of the examples here were stimulated by the shape or texture of the raw material.
This bagatelle arose from some scrap strips of aluminum:
Our chemistry department had scrapped out their old computers and I was able to buy thirty of their 14″ iron-oxide-coated aluminum hard disks. Bolted together, they made a suitable helmet for the aluminum slab construction portrait of Alex –result: Conquistador.