I'm actually not a fan of oil slicks. But I am a fan of the rainbow sheen affect that happens when oil floats atop a small puddle at the gas station, while you're filling up your car on a semi-sunny afternoon, and wondering what to paint your nails.
Yes, this is how I decide on colors and designs.
I know. It's odd. Just roll with it.
That's Pahlish "Sitting in a Tin Can" with a layer of Sinful Colors "Let Me Go" over.