A tiny tunnel of green

Which should fit the theme of something green.
And in extras a couple of dolphins which will be auctioned for charity.

One of my favourite sayings is Chapeau or hats off to you.
This is often used if you are impressed by someone's action or to congratulate someone. It comes from the expression ‘tirer son chapeau’ (to pull one's hat)which means the same and refers to the 17th century when men used to take off their hats to greet someone in the street.