One of the rules I follow when taking photographs is to look up because what lies above the eye line is often interesting yet goes unnoticed. It pays to look down too.
The garden at Ham Library has some environmentally friendly structures supported by concrete bases that have colourful tiles in them. Those tiles are inscribed with drawings that reinforce the message of object so the water butt is surrounded with tiles that show things like a watering can, rain and a message calling for taps to be turned off.
Similarly the bird table has tiles that show birds and trees.