I was watching Back to the Future Part 2 the other night when I saw this hat the main character was wearing.

http://www.amazon.com/Back-Future-Marty ... B001RJ1U6G

It made from this highly reflective material that is different colors of the rainbow depending on what angle its viewed from. I think the "Rainbow" color of this might be the same stuff.

http://www.sommers.com/catalog_i6053063 ... tId=256799