Just to clarify, the colors are all from the towel. There was no coloring in the oil or water. Also, the photo is of a cluster of small "bubbles" less than 1/4" long. they were sailing along one of the larger "bubbles". So, the large bubbles you see in the pan are just from letting the oil sit and the bubbles aggregating.
. You like my nice little reflector sticking out of the right side? Its made of tin pans (The disposable kind that are like $.30 each) all bent together. 