Sewable Electroluminscent (EL) Wire Welted Piping- Aqua 5 meters : ID 675 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits

EL wire starter pack - Blue 2.5 meter (8.2 ft) : ID 583 : $19.95

EL wire 2xAA pocket inverter : ID 317 : $4.95 : Adafruit

EL Wire/Tape/Panel Products Category on Adafruit Industries

Green Electroluminescent (EL) Tape Strip - 100cm w/2 connectors

MIYOKA El Wire 5m/16ft Flexible Neon Light

Blue Electroluminescent (EL) Wire - 2.5 meters : ID 408 : $5.95

adafruit-Flexible Silicone Neon-like LED Strip - 1 Meter

EL tape is the big sister to EL wire - it has the same glow effect but with a flat, wide shape instead of a round shape. The glowing part of the tape is 1 cm wide (the plastic coating is about 1.5cm wide). The other side has an adhesive on it so you can stick the tape onto something. Its covered in what seems to be PVC, the tape is thus weather-proof - but note that the connectors are NOT waterproof, just a bit of heatshrink.

adafruit-White Electroluminescent (EL) Tape Strip -100cm w/Two Connectors

They look a lot like neon, but without the need for expensive transformers, glass tubing or inert gasses. Super flexible and bendy, they feature a single-color non-addressable LED strip with a solid chunk of translucent silicone rubber as a diffuser.

adafruit-Flexible Silicone Neon-like LED Strip - 1 Meter