London has much to offer the visitor - even if that visitor is there for the express purpose of colouring the city in. In this lightning tour round town, the crayon tourist will find dozens of tiny details to admire, and to colour in any way, realistic or eccentric, he or she chooses. From the familiar outlines of Tower Bridge or the Houses of Parliament to the less well-known views along the canals of Little Venice or the Georgian streets of Spitalfields, every tile, cobblestone, London bus and striped shop awning is just crying out for colour - and when you've finished, you can pull the perforated pages out and pin up your masterpieces to be admired.