I alway like the little ones sprayed onto the kerbside showing where the road markings should be placed.
I spotted these in Mitre Street, EC3, last month.


Mr Cranston's Waverley Temperance Hotels – a Link Between Edinburgh and London
Large Lumps of York Stone Beneath The Duke of York Column
Broken Glass and Gas Lamps on Horse Guards Road
Railings Made from Wartime Stretchers – Spot One and You'll Start Seeing Them Everywhere!