as long as we are talking balloons...
once i made some pieces by filling balloons with water, tied them, draped slabs around them, then put the whole combo into a net bag, the kind that onions or old style sausages come in..thin plastic netting. i tied off the netting with some cord and suspended the clay/water balloon/netted forms from a low hanging tree limb (i was working outside)
then i paddled them to smoth the seams and impress the net texture and experimented with tying the forms with cord, cinching them here and there, and let them dry to leather hard. removed the cord, the net bag, pierced the aballoon to pour out the water. i ended up with some pretty cool organic shapes which were salt fired. i believe i used porcelain with fiber content for the clay.
i wanted to experiment with a different way of making forms. The idea of working on a suspended form rather than a one built up from a surface intrigued me. plus it was just kind of fun playing with the balloons on a nice summer day. they did look like odd fruits or ausages curing out there on the tree.