So far, I have only seen clear crackle and pale green. In the early days of collecting water bottles I thought this might be Marine Crystal. All of them seem to have a very thick portion at the bottom and extremely thin glass at the top. The spouts are best described as miniscule. Someone I consider to be an expert on West Virginia glass told me that she has one with a label and they are contemporary and made in Spain. Mine were all offered as Blenko and had no labels.
Blog Update: march 13, 2013: I have long suspected that these water bottles were sold at Pier One Imports. A long time employee confirmed today that indeed they were imported by and sold at Pier One a number of years ago.
Here you can see how thin the rim is and how small the spouts are. Below is a photo of the label added to this post in November of 2013.