I saw spinning shapes too: spirals, figure eights, spheres of rainbow pointillist light. Or just swirling patterns like schools of fish. They all moved slowly. When I tried to focus they just disappeared. For me it was relaxing. I watched for about 5 minutes.
Sounds like what I see when I press my fingers (gently) onto my closed eyelids. I think it's the different layers of the visual cortex trying to find edges/patterns in something that doesn't have any.
