The blue and gold-painted work, titled Green Man Humpty Dumpty, is one of 123 giant decorated eggs hidden along a trail for charity. The Queen and King commissioned Alice Shirley to design the eggs for conservation charity Elephant Family’s The Big Egg Hunt, where people can win prizes by finding the two-foot pieces across London.

https://www.thenorthernecho.co.uk/news/national/25055683.queen-praises-wonderful-large-easter-egg-installed-buckingham-palace/