It's a bit hard to see, but it might be airbrushed.
AAirbrush sky blue. That's how it's darker in some spots.
Since I dont have a airbrush I guess my 2nd option is what color to use to make MMF fondant in a similar dark color? Royal blue?
I would think royal blue with maybe a tiny, tiny dot of black.
I think you are going to have to play around a bit. Take walnut size pieces of fondant and color it. You might even end up mixing together some of the test lumps.
I think the color variations on there are just from the lighting, that looks like colroed fondant straight out of the tub.