Once you have a casting of the hands/feet/what ever, and a rubber
mold of it, make a casting using a product called “Reducit” (from
Pink House Studios, 35 Bank Street, St. Albans, Vermont, 05478
802-524-7191) and you can make a reduced copy of the casting (this
stuff shrinks). If you then make another mold of the shrunk item,
and again cast it in Reducit, etc. you can get hands, feet,
whatever, small enough to make earrings, pins etc. and if done
carefully, you will STILL have the finger prints in the small item. A
friend of mine did this with a casting of his hand, and you could see
the finger prints in the final castings that were about 1 inch high.
These folks also have all sorts of body casting supplies and
instruction tapes as this is their main area of sales.