These pictures are of a CICU Hospital project, the conduits are colored to match conduits and J boxes above the ceiling and within the walls, they represent Normal, Critical, Life Safety, and Equipment branches. We have been doing this in Hospitals and some other facilities for 20 years or more. It makes maintenance and up-fits much easier.
Anyways the crew who did this project did an excellent job IMO, even though I may be bragging on them. (They do work for me
BTW, the work above the suspended ceilings is just as nice.