Jason said:
Sea glass? Is that just worn down shards? Looks cool. I like the blue/white speckled on.
Yep, it is glass worn down by the waves and sand. It is amazing cool to collect. Rare pieces can be cobalt blue or purple or even red. Sometimes you can still see embossing on the pieces. I've seen pics of the tops of old beer or soda bottle that broke off and were worn down into perfect circles you could wear like a ring. I used to look for it at Hampton and Salisbury beaches in NH and MA when I was a kid.
I was surprised to discover that you can also find it along the shores of Lake Ontario up here in NY. I guess there's enough wave action on the Great Lakes to produce it as well.
I've also seen bags of it for sale in stores like Pier 1, but I'm certain that it was artificially produced.
Check out:
http://en.wikipedia.org/wiki/Sea_glass
and
http://www.pureseaglass.com/index.html