As recently as 2011 the steps were re-laid using a variety of 104 different marbles. The colours were beautiful.
The step below is my favourite.
The swirl in the blue and green step below looks a bit like Hokusai's woodcut image The Great Wave off Kanagawa - at a stretch!
The next step reminds me of a cave painting.
If you are visiting Edinburgh and want to make your way to the Royal Mile from Waverley Station, the steps are definitely a route worth taking.