In the pic of the two missiles, the bodies look to be metallic grey (a dull silver-grey), with Olive Drab warheads and what appear to be bare metal fins, hence the 'blue' tone on the fins, from reflected light.
On aircraft 50 - 20, the missiles appear to be a light grey, possibly something like Gull Grey or Ghost Grey, maybe even Neutral Gray, as the picture is slightly over-exposed, and in string sunlight.
Again, the warheads appear to be a dark Olive Green, but could possibly be a very dark blue-black, with the fins probably again bare metal. However, there is a probability that, for the display, these might have been training rounds (and probably were), in which case the dummy warheads would be a dark shade of blue.
On aircraft 50 - 28, again there is some over-exposure, from the strong sun light coming through the open hangar doors, which has effected the tones. The missile bodies are more likely the same light to mid grey, fins possibly / probably bare metal, and the warheads in Olive Drab - the latter may be looking lighter due to exposure of the picture, or perhaps as these may be 'dummy' live rounds, well used for display, with worn or faded paint on the warheads.
In such 'load out' displays, it's unlikely that real live ordnance would be used, and quite common, in most air forces, to use 'dummy' or inert ordnance, painted to look like the 'real thing', although there would be stencils indicating that they were dummies - just in case other dummies loaded them as the real thing !