Well dressing dates back to the 1300's, and is thought to based on pagan rituals giving thanks for water. The ritual is carried on mostly in Derbushire, although Endon, in Stoke-on-Trent has a well dressing each year - they usually take place in spring or summer and coincide with a country fair or similar celebration. Briefly, people build a mosaic out of natrual materials, usually into a series of one-inch square frames which are then assembled to buld the picture, which usually standsa round five feet tall. It is transported to the well, and usually left for a week or so - weather permitting. Some well dressing committess keep their design secret until the day, others let people watch the mosaic being built. Oddly, the practice has hardly spread at all outside Derbyshire, but Endon, near Stoke-on-Trent has one, but I've never actually been, so I can't say how good it is.