Iris folding is a paper folding technique, when finished, resembles an iris of a camera or an "eye". Traditionally, origami paper is used for the main design and holographic paper is used to fill in the center of the design. Backs of patterned envelopes are also used for this craft as well as ribbon, wrapping paper, napkins, fabric and tissue paper. Almost anything that is thin and flat can be used to create these wonderful works of art. More information can be found here. There you can find complete instructions and patterns.
Over the years, I've made family members note cards. The following pictures are my first attempts at Iris Folding.