This fountain is on campus at work, and one morning I caught a nice rainbow in it! Not bad for a phone-camera-photo.
At work there is a large pond area with fountains that provides a heat-sink for the HVAC systems of nearby buildings. It also provides a waystation for a lot of geese. On this hot day, the geese were swimming under the fountains to stay cool (I presume) and we all enjoyed a rainbow together.