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Before the 2012 Olympics started the Royal Mail committed to turn a red post box gold for each British Gold medal, Olympic and Paralympic.  In the event this meant that over 100 boxes turned colour.  Each one is associated with a particular gold medal and has been chosen to be close to the medallist's home town/borough.  Here's the map.  We don't believe that the Royal Mail despatched an employee with a pot of gold paint the instant the medallist crossed the line but they have said the colour is permanent.

The Royal Mail have their own website of memorials, nationwide: https://www.royalmail.com/memorials/home .

2022: Londonist have posted (ha ha) an excellent page on postboxes.