I recently attended the 6th Annual Sewing Expo at the Fox Valley Technical College here in Oshkosh, WI. One of the classes I attended was a 1-hour session with Fiber Artist Joellyn Quinn on Iris Folding. In less than one hour, attendees created the following 2 samples (Actual size is about 2-1/2 inches square) :
Log Cabin Sample in Fabric
Log Cabin Sample in Paper
It was remarkably fun and fast! And you can see the obvious ties to quilting ... The small size makes it perfect for a greeting cards or scrapbooking. I can see this having potential for postcards, too.
Here are a few more sites on Iris Folding :