Fun thread - possiblities approach infinity.
My spin: turn padauk/ebony or dyed blanks, sink a forstner bit trough about 1/8" deep in each, part off, sand bottoms, texture edges on band or scroll saw (or Dremel/Foredom flex shaft) for easy handling, inset a circular photo of pet or person (or red/green olive or you get the picture) in each, insert circular playing card king pictures into the kings, fill with PR or Alumilite, pressure cast; then convince millenials that these are better than video games because they do not not require electricity beyond the usual somewhat environmentally-friendly synapses of the electrochemical brain that comes standard in most (or perhaps many) human skulls.