To make a river stone mat first you have to gather or purchase river stones. After that take a plastic mat and arrange all the stones on it. Then stick all the stones one by one to the plastic mat by using silicone sealer. Let the sealer dry completely.
Kwik Sew 3900 from Kwik Sew patterns is a Olivia& Organizers sewing pattern. A couple of curtain poles, pouchees made from fabric or yarn could then be made to shapes perfectly suited for the items being stored!