Master Ulthar
Akonite
ooh... what about EL wire/piping?
YOU MEAN LIKE SHINEY SHINEY SHINEY LIGHTS?!?! I CAN'T USE THOSE BECAUSE I'D STARE AT THEM FOREVERZ AND BURN MY EYES OUT!!!
Or really because I don't know what I'd do with it. If I had a reason for it it'd be awesome, though...
well, after reading akonites suggestion, im thinking of making a prop sword with Electroluminescent Wires running over the blade and into the hilt... could put the power supply within the hilt and the wires can be set into channels cut into the blade to make some sort of weird circuitry effect... feel free to steal that idea
::EDIT::
maybe something like a steampunk version of this:
http://images.wikia.com/fable/images/7/74/Avos_tear.jpg
Avo's Tear from Fable 1: The Lost Chapters
::EDIT 2::
another idea, again for swords or blades, what about having a length of EL Wire suspended alongside a metal rod, kinda like a steampunk lightsaber, though more like Travis Touchdowns "beam katana's" from No More Heroes (linky goes link hunting again......)
3D Model from Game: http://levelselect.co.uk/wp-content/uploads/2007/08/blood-berry.jpg
Physical Model for Cosplay: http://purenintendo.com/wp-content/uploads/2007/11/travis1.jpg