I really hate it when a space is paved in a material of the same colour, as the surrounding buildings. It nearly always seems to happen when you have brick buildings, like in the above picture (all pictures are of the lovely Bede Island in Leicester).
It's the built equivalent of when someones Dad decides it looks cool to wear both pale blue jeans and a denim shirt, or you see a really posh person in mustard coloured, corduroy trousers and a tweed jacket.
It. Just. Looks. Wrong.