I’ve made Christmas lights, in the past, from plastic cicada whistles from Australia.
This year I tried something new and used real cicada exuvia (skins/shells) and LED “fairie lights”, which seem to run cool enough that they won’t be a hazard to the fragile skins. They look pretty. I’m still in the testing phase, but the results so far look promising.
I just found this website and I love it! The cicada lights are so beautiful, but I bet they were pretty fragile.