I found this interesting squidoo list on Iris folding put together by Lisa Vollrath who is a mixed media artist. Lisa describes Iris folding as
A technique that originated in Holland. Color coordinated strips of folded paper are taped into place over a pattern, creating a spiralling design that resembles the iris of an eye or camera. Originally, Dutch crafters would cut their strips from envelopes with patterned interiors, but now it is common to use lightweight papers including those used for origami to create iris folded designs.