well, the way i would produce these types of glass would be as rondells. i don't have the techniques for sheet glass, and i'm not sure what crown or boullion glass is. i'd need links to see what it looks like and whether i could reproduce it. i can produce rondells quickly and with out much heatache, and i know for a fact that the are period as my instructer was and is a jamestown glassblower. his name is chad clark, you can look him up. rondells limit the size that i can manage to perhaps 12 inches circular. the process involves literally spinning a round bottomed cup untill it becomes a flat plate. the glass i has access to is fairly clear soft glass. it has a slight greenish tint to it when it has more than 1/2 inch of thickness. i can add small amounts of color to it to cerate a more greenish tint which would be more accurate. as for seed bubbles, the best i can do for that is to take my gathers from the furnace before the batch melts fully, thus giving me seed glass, but there is an increased chance of trash in the gather. trash being potstones from the furnace.
bill: i will work up some samples and get some pics up asap.