I was planning on photographing something else, but by happy accident, I discovered this instead.
By tilting my iPhone at an angle above my white counter top I was able to create shadows on the counter top surface that had a blue green hue. There were several light sources and the shadows would overlap at certain points creating an image similar to an abstract painting.
The shadows would overlap and reinforce themselves, creating edges or simulating folds, but it was all just shadows and light.
Muted blues and deep greens were created by merging the shadows created by the iPhone and captured by the iPhone camera. The light sources were two overhead incandescent lamps and natural light from a window.
Moving the camera created different overlapping shadows and different colors and edges.