I have seen a few on the Rightmove thread with "Be like a flamingo in a flock of pigeons".
As well as the whole aspect of why the hell would you want to see that in large letters in your wall every day, it makes no sense. Flamingos are a social bird and live in very different habitats with different food sources than pigeons. They take in large amounts of mud and water in their big beaks then filter out anything they can eat. They are not equipped to peck at small seeds and whatever else pigeons eat. The colouration in what they eat gives them their famous pink colouring.
A flamingo in a flock of pigeons is something that will be lost, confused, anxious, and it's bright pink feathers will dull before it dies an agonising death of starvation and dehydration.
Why would anyone aspire to that enough to put it on their wall in large friendly letters? It is probably the most desperate cry for help I have ever seen. I hope it is not the reason their houses are now on the market.