Heared you ever about "beach glass seekers"? People, who collecting beach glass (sea glass). Some of them using bech glass for making jewelry. You can know more about it unusual hobby from online magazine "Sea Glass Journal".
One of the most interesting places for beach glass seekers - Glass Beach, Fort Bragg, California, USA.
Glass beach - is a really unique beach, the area around Glass Beach were a public dump.
After 30 years natur recirculat glass trash into tonnes of glass "gems". Amazing place.