Flexible tube for threading through transparent round bricks
If I'm understanding you correctly, you'll need 1x1 round bricks and something bar-sized and flexible to hold them together.
Alex pointed out that the hoses typically used for this sort of thing aren't available in trans-clear. Pneumatic tubing has been produced in trans-clear, so it could be an option, but you'd need a different design, as pneumatic tubing will not fit through an open stud.
You could use fiber optic cable:

I tried stringing some transparent 1x1 round bricks on it, and I think it creates the look that you are going for: