Thanks to Sarah for sharing this idea with us!
I thought I would give you another Fish craft idea, that was a take off of the one you listed using a coffee filter.
Use two regular sized paper plates, and a "triangle" shaped coffee filter, I used white so the kids could paint them. Using the coffee filter as the tail, glue it to the inside of the two paper plates, then glue the paper plates together. After the kids painted them we put faces on them and "googly" eyes. I sprayed them with glitter spray so they would sparkle. When I did this we were learning about the letter Ff, so I wrote Ff in the center of the body. And part of the lesson plan, was reading Rainbow Fish.
It was a very fun activity.