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.
These are fairie lights, if you’re not sure what I’m talking about: