It appears that PM was trying to put the toys for boys in blue boxes and those for girls in pink boxes at one point.
There are pros and cons to this. As competitors do this, it does simplify figuring out which set the little emperors and empresses may want.
But it does lead to major stereotyping, with boys being ridiculed for playing with sets that come in pink boxes and vice versa for girls with blue box sets.
For this reason, I support bringing out everything in one color box, and the blue one is quite easy to find with so much pink stuff in the toy stores. When I enter a store, my eyes are scanning for the blue boxes, and often it is hard to locate PM because it gets lousy shelf position in most stores. Maybe they could use some silver on the traditional blue boxes to spruce them up a bit. TTFN, Pgal