You can see difference between absolute white and morning glory....if you want to visualize this for your room try it on Asian Paints app to get a clear picture of your room.

They are tiles I feel which had been fixed on top...so its difficult ot paint of tiles , just try ot polish them with a polish liquid ...if you need a different looks ,then you need to remove the existing tiles and paint whatever color you want...but for fountains and water surfaces , try ro avoid paint as the paint degrades ...

Hey, Yes, Sonnet L146 is very commonly used color home interior walls and a combination of white on the ceiling. You may also tryout some different color options for rooms as single color for the whole will be a bit bland.

Either, you can paint all the walls with light grey or white colour. Or, highlight one wall with light grey colour and rest of the walls can be white.