I don't have a pattern but I have an idea that would probably work.If you have a hand held fan just make a pattern from it. If not make a design you think would make the most air flow.You could use old greeting cards cut in circles or any shape.I would use posterboard & glue the cards on.Use a paint stirrer or tongue depresser for handle. You can put clear contact paper over the fan so it could be wiped off & last longer. You could also print pictures & let children color them & paste them on your form.
This link has some great history and photos that might give you ideas of how to make folded fans by looking at the pictures. Scroll down to page 66 for some easy instructions for paper plate fans:
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