Hi grandmum, this technique is Iris folding because the template ends up in the middle. Just like the middle of your eye, There are lots of tutorials on the net if you wish to see how it is done
these are lovely Chris!
Grandmum herre are a couple of good sites for free patterns and instructions
http://www.irisfolding.com/freepatterns.html
http://www.irisfolding.circleofcrafters.com