Indeed. To me, they are just funny pics. My fave is one that doesn't actually show anything - the one with the two kids peering up the piper's dress. The look on those kids faces is priceless.
And as liv also said, it's the tough guy in a skirt letting it all hang out thing. The fact that the kilt and one's tartans are generally formal dress for formal occassions makes it even more fun, methinks.
I just have a very juvenile sense of humour.