I have done these as 'gifts' for parents .... we did hand prints with craft ink and than cut them out and that size shrunk down to be about the size of a quarter ~ I will see if I can find a picture to show you.
if you want them for 'jewellery' I would definitely cut the 8x11 paper into quarters at least if not 1/6 of the paper other wise they will be more like 'sun catchers' for the window
Okay another dumb question -- is craft ink different from a normal washable stamp pad? Do you think a handprint like that could be done with tempura paint and hold up?
Did you really string all those beads and make the clasp?