hi Anonymous,
I'm late with the suggestion, I have only just found this forum.
I have made icicles for the Christmas tree by designing the shape onto a plastic sheet, using woodworker's glue. That is acrylic glue. When it dries it comes out clear and flexible. Just draw several layers of the glue over each other, leave to dry between layers. Its easy to control the amout of transparency this way.
Well it probably doesn't help you now, so many months since you asked, maybe someone else has the same question and finds this a useful idea to try ...
Hey, I'm pleased to be here... hope to contribute a bit, it looks like a most instructive and lively forum.
JULA