The bath sponge

Friends and family collect their trash, meaning the raw material, for me, because I keep running out. There is also a group of young students going through the trouble collecting the nets in their dormitory. From them I recently received some lengthy bluish plastic netting nobody could make sense of. The best suggestion was that it could be rolled up to be used in the bathtub as a sponge. This friend had also given me earlier some left-over fabric (from her mother's sofa cushion) which matched the colour of the plastic. So hey, I had blue leather, proper lining and a button to go with it...