hurrah
is that little wee fireflies inside the helmet, glued to a string that's affixed to the centre top of the helmet?
( The Figurative Pineapple stared in awe at the breast. Sadly, it was his., Mon 1 Aug 2005, 17:45, archived)

possibly.
Or a small candle, and some coloured crepe paper. I hadn't worked out the specifics.

I like the firefly idea better.
(bennyhillslovechild A walking jam-jar and syringe, Mon 1 Aug 2005, 17:46, archived)