Motorcycle Helmet Led

I saw this a long time ago (2003 or 2004). There were helmets, gas tanks, and fenders for motorcycles that in regular daylight looked like regular paint jobs. But when you turned on a light on they would light up in a symbol, image, or name through the paint. Some were custom ordered by gangs with the gang logo or nicknames. I can not find anything about these or the process to make something similar.
Honestly it wasn't stickers. It was actual LED lighting. From how it looked they painted one or two coats of whatever the paint was from the inside. then taped the design on the inside and sprayed the remaining layers. So when they take the tape off and light it from underneath it illuminates the logo, then during the day it looks like a normal gas tank, helmet, etc. That is my guess to how they did it, cause there were no stickers. Good thought though, I may look into those as well.