You're looking for a display with RGB back light? ELECTRONIC ASSEMBLY, a manufacturer from Gilching near Munich, Germany, provides slim displays with RGB back light.
Displays with RGB back light can be illuminated in different colors. The various colors of the RGB back light can show a operating condition like a failure or something.
Individual controlling means infinite different color. Displays with RGB back light fullfill all imaginable design principles.
There are character displays for texts (1x8, 2x16 and 3x16 chars) and grafical displays (132x32 to 160x104 dots) available.