what size foil squares to wrap chocolate truffles?

So much leftover chocolate truffle base that I better package nicely and get out of the house:

Is there some ratio or rule of thumb to spare me from experimenting on the right size and shape of bon bon to fit either a 3, 4 or 6" square foil?

Cube, ball or flat-bottomed egg are all fine by me; typically my portioning is not more than an inch thick.

Sorry if this post is more geometry than cooking but appearances count too