It looks like a piece of Photoshop trickery, but that bit of fairlyand fungus is Entoloma hochstetteri, the Sky Blue Mushroom. In its native New Zealand the mushroom is well known, appearing on a postage stamp and on the back of the country's $50 note, but it is virtually unheard of outside the Land of the Long White Cloud. The Sky Blue Mushroom is probably poisonous, but no daring forager has offered to find out. There are more pictures and information on Kuriositas.
Link | Image credit: little tomato
Awesome little mushroom though!