While I was at a convention (MuseCon, in Chicago) someone asked me to try tying a knot in some "elwire", electroluminescent wire. The sample he offered me was much thicker than my usual medium, and the work went less well than I could have wished, but it did seem interesting.
This next picture is of a bracelet that I've just completed, using the thinnest available elwire, 1.2mm in diameter.
Taking the same picture with a flash shows what the bracelet looks like without the glow:
I also made a choker of the larger Prolong knot pattern. It's stretchy and flexible, unlike the bracelet, and it looks a little surreal. Both knots are showing in this picture:
The cotton Turk's-head bracelet with the wire tucked through it gave me an idea, so ...