So what can you do with it?
Accent corners (such as the hems of hats, the curve of goggles, helmets), costume hems and seams (like the bottom of a skirt), jutting shapes (like the collar of a jacket), or create designs in the center of outfits (such as luminescent images). You can even light up a whole outfit by creating rows of el wire.
Some various ideas on how to use El Wire.
Where can you get it?
Online here: http://www.elbestbuy.com/
Or here: http://glowhut.com/
Buy Local Here: http://www.coolneon.com/
More about El Wire: http://azburners.org/elwire.htm
Some more ideas:
El Wire dress by Diana Eng
Design by Englighted.com
Wings By http://www.totalfuckingarmageddon.com/Projects/Clothing/