A more attractive smoke detector

As far as I know, all smoke detectors are off-white. Presumably they're off-white because most ceilings are off-white. What if I don't have an off-white ceiling? You're not supposed to paint a smoke detector, so how do you get a smoke detector that matches a colourful ceiling? I propose smoke detectors in various colours. It's not difficult to just do the plastic in a colour other than boring off-white. I know it isn't practical to make smoke detectors in every colour that a ceiling could conceivably be, but I for one wouldn't mind having a turquoise smoke detector. It might make my off-white ceiling a little more interesting.