Something like this should do the trick.
EL inverters are fairly common now, just watch the output voltage.
12V electroluminescent inverter for A5 EL panel sheet backlight lamp strip wire | eBay
Item: Electroluminescent inverter for EL panel and other EL products, such as EL wire, EL strip, EL light, EL display, etc. We carry other kinds of electroluminescent inverter.
www.ebay.com
EL inverters are fairly common now, just watch the output voltage.