A flat soap film is made by dipping a wire frame into the soap bubble mixture.
The frame is held above a dark surface, and a studio light is aimed at the bubble. The camera is aimed so that the reflection of the light will be seen over the entire surface of the bubble, and a macro-photograph is taken of that reflection.

All images are created completely in the camera with minor contrast and saturation adjustments.
Please take a moment and see where your imagination takes you.

Soap bubble. Interference and reflection - Wikipedia, the free encyclopedia
Olympus Microscopy Resource Center: Light and Color - Interference
Exploratorium.edu - Bubble colors