Glass Blowing has been known and practiced for centuries. The most recent expansion of the craft has been to support all the recreational smokers of a certain illegal substance.
However, glass blowing is still used to make specialty scientific glassware and objects of art. In looking through Ebay listings there are many beautiful pieces of art and assorted other objects.
I was surprised to find pre-world war two uranium glass rods for sale. Uranium glass will fluoresce under ultraviolet light which makes for some interesting optical effects. The bidding was fierce too.
Below are current Ebay auctions for glass blowing that will give you a feel for the amount and kind of interest in the subject.