Thanks for the comments, much appreciated.
To be honest I can't remember if the cobblestones were purplish or not but I think they were close to that colour, might have been the light on the day?
Wish I had taken my time a bit more with the shot as it is slightly blurry by the bench legs but as I said, I was just strolling past and snapped it. Would have gone back with my tripod and properly given it a go had I known it was going to be a "framer"
Was only very new to photography at the time and wasn't thinking of light/correct exposure/aperture/shutter speed and composition unfortunately.