I recently started making and selling sea glass jewelry, and people seem to really like it. I just returned from a trip to St. John in the U.S. Virgin Islands to scuba dive, photograph and hunt sea glass. I had a very successful hunting trip, and came back with a bag full of good quality seaglass. Here's a photo of my "loot":
Unfortunately, the trip didn't yield any rare colors like cobalt blue or red, only common green, brown and white, but it was mostly good quality.