We were just at the beach in Galveston, TX, on the Gulf Coast, and did some combing for beach glass. We spend, maybe, 45 minutes at it, after the tide had gone out and it was getting dusky. For some reason, the pieces were easier to see--sunset glinting off of them, I suppose. We looked mostly in a line of debris midway up the beach. My husband also found a lot of his pieces under seaweed.
We (two of us) collected (along with shells) enough to fill a quarter cup measure. The most common color was beer bottle brown, then green, and then white. Some of the white was more frosted than the others. A friend of ours found a piece of dark blue glass, which we decided was actually half of a glass bead. My husband found a lovely pieces of well-tumbled lavender. I also found a really pale blue but fairly clear and sharp piece. The not-sharp-enough-to-cut pieces got thrown back.
My husband liked to make a game of trying to figure out what kind of bottle a piece came from. The brown and black ones are easy enough to guess, but we could think of any drinks for the lavender piece. We finally supposed it might have been a decorative or perfume bottle.