I hand cast and mold my own faces from antique statuary, beads, other fun face cabs, stamped images, etc. using clay. Whatever I find that would make an interesting personality and is usable.
Attach them to mixed media art, ArtDolls and collages. You can also bead weave tubular peyote around them for bracelets, pendants, earrings and more.....
An industrial type glue E-6000 or Fabri-Tac can be used to attach them to ultra-suede, felt or any stiff medium.
Samples of figures involving the face cabochons: