Most patterns are a geometric shape...triangle, square, pentagon, hexagon or oval. The templates for these geometric shapes can be found online. One source I found is here at IrisFolding.com. In addition to the geometric shapes, they have alphabet, numbers and several decorative shapes. They also sell a book called Simplicity of Iris Folding. I have not seen the book, but you can learn how to do Iris Folding online, if you don't understand the concept.
Another source for patterns and information is the Yahoo group. Iris Folding at Yahoo Groups has recently been revived and has become quite active. I recommend this group!
I suggest you get a loose leaf notebook, some page protectors and print the five geometric shape templates. Using a page protector keeps your pattern from getting messed up. Diecut your aperture from cardstock. Use reposition able tape along an edge so that you can lift your design as you work it and check on the progress. You can also print on acetate and then look on the other side of the pattern to check on your progress.
I choose the shape I use depending on the basic shape of the diecut. I meant to use the triangle on the owl going the other direction to form a beak....I will correct that next time I do an owl design! The shape you choose will also determine how many different papers you use. On the ornament, I used each of the wrapping papers twice rather than using four different papers. I like wrapping paper as it is thinner and doesn't create as much bulk.
Jan Castle, does some of the neatest Iris Folding I have ever seen!