Now I had the paper, LED and the (3v) battery, I could make a proper prototype, one that I could test for longevity, for useability...and mainly for problems.
I folded a crane from the printer paper, slid in the LED, and pushed the sticks through the top. This presented the first problem - the top of the crane is the weakest point, and I'm basically pushing holes in it. So I need to work on that.
Then I added the battery to the LED, and wrapped it up in insulation tape. This presented the second problem - the insulation tape is too sticky, and the adhesive was getting between the contact on the LED (the stick! I found out the proper name!) and the battery, which was making the light flicker. Annoying enough for one crane, but can you imagine a whole roomful, all flickering intermittently? So I swapped the insulation tape for sellotape, which worked much better, but was still a little flickery, so that's something else I need to work on.
However, if you ignore these problems, I have my new, all improved, prototype!
Overall though, the idea is pretty sound. It seems feasible and feedback so far has been pretty good. I'd like loads more feedback though, so I'm going to put the idea out there a bit more, and if you want to let people know about the blog, and leave comments, I'd be ever so grateful!